What's New at Kenhub

We've redesigned the quiz summary you see after every study session - it's now simpler, clearer, and a lot more motivating:

Why we changed it

The old summary tried to do too much. Different percentage numbers, a segmented progress bar, and an "advanced" screen with separate learning progress for every subset of a concept... helpful in theory, cognitive overload in practice. After internal testing and your feedback, we knew we could do better.

One progress score, all your concepts

Every quiz is built from concepts - an anatomical structure like the biceps brachii muscle, a physiological term like the action potential, or a cell type like the erythrocyte. The new summary lays them all out in front of you:

A single progress score shows exactly how far you are from bringing the quiz to 100% and how many concepts you have yet to discover:

Hover over any concept to see what it is. The color shows how well you know it (Level 1: Learning, Level 2: Mastering, Level 3: Mastery):

Discover them all, study them all, master them all. Bring every concept to mastery to be exam-ready - then take the exam quiz to complete your study unit:

Your progress, session by session

After each study session, the summary shows you what changed since last time - which concepts you newly discovered and which ones moved closer to mastery. Guiding text keeps you in the loop on what to do next and nudges you to take one more session to master the remaining concepts:

We hope you'll find this redesign as useful and motivating as we do. Jump into your next study session and see how far you've come.

Happy learning!

Mechanoreceptive somatic senses allow you to perceive mechanical stimuli acting on the body, such as touch, pressure, vibration, and body position. These sensations depend on specialized sensory receptors called mechanoreceptors, which detect physical movement or distortion of tissues and help the nervous system interpret what is happening at the body’s surface and within muscles, tendons, and joints.

We’ve added a new video covering the physiology of mechanoreceptive somatic senses, including how tactile and proprioceptive information is detected, transmitted, and interpreted by the nervous system.

In this video, you’ll learn about:

• The difference between tactile senses and position senses
• Cutaneous mechanoreceptors involved in touch, pressure, and vibration
• Key tactile receptors, including Merkel discs, Meissner’s corpuscles, Ruffini endings, Pacinian corpuscles, and hair follicle endings
• How mechanical stimuli generate receptor potentials and action potentials
• The role of A-beta fibers in fast tactile signal transmission
• Receptive fields, two-point discrimination, and adaptation
• Proprioceptors involved in body position, including muscle spindles and Golgi tendon organs

Continue studying sensory physiology by watching the full video on mechanoreceptive somatic senses:

Pain and thermal sensations help protect the body by detecting potentially harmful stimuli, such as extreme temperatures, sharp pressure, or tissue damage. These sensations rely on specialized receptors and pathways that allow the nervous system to identify danger, trigger protective reflexes, and send information to the brain for conscious perception.

We’ve added a new video covering the physiology of pain and temperature perception, including how nociceptors, thermoreceptors, nerve fibers, and ascending pathways work together to process these sensations.

In this video, you’ll learn about:

• The difference between nociception and pain
• Types of nociceptors, including mechanical, thermal, chemical, and polymodal receptors
• Fast pain and slow pain, and how A-delta fibers and C fibers transmit these signals
• The role of the withdrawal reflex and spinothalamic tracts
• How the neospinothalamic and paleospinothalamic pathways carry different types of pain
• Pain modulation through the descending pain suppression pathway and gate control theory
• The difference between somatic pain, visceral pain, and referred pain
• How thermoreceptors detect temperature changes and transmit thermal signals to the brain

Continue studying sensory physiology by watching the full video on pain and thermal sensations:

Glial cells, also known as neuroglia, are essential support cells of the nervous system. While neurons are responsible for transmitting nerve impulses, glial cells help maintain the right environment for neurons to function by providing support, protection, nourishment, myelination, and immune defense.

We’ve added a new video covering the main types of glial cells found in the peripheral and central nervous systems, and how each one contributes to healthy nervous system function.

In this video, you’ll learn about:

• Schwann cells and satellite cells in the peripheral nervous system
• Oligodendrocytes, astrocytes, ependymal cells, and microglia in the central nervous system
• How glial cells support myelination, cerebrospinal fluid regulation, immune defense, neuronal health, and nervous tissue repair

Continue studying the nervous system by watching the full video on glial cells:

You can now choose which content to include in your study sessions. Plus a simpler layout and a faster way to start.

Pick exactly what you want to learn

Go to any study session inside a study unit and click "What you'll learn" to see every structure and concept included. Don't need a specific one? Remove it with one click. Changed your mind? Add it back just as easily.

Hit "Start studying", and you'll get a tailored quiz with only the content you selected. Your choices are reflected in your stats and quiz summary too.

When you take the exam quiz, it uses the content selection from your last study session (no need to set it up again!).

A simpler, more organized layout

We've split study sessions and exam quizzes to better match the natural learning path. Study sessions live in the learning phase of the study unit, right where you'd expect them.

The exam quiz sits at the bottom. Pass it to complete the study unit and earn that golden badge!

To make quizzes easier to start, we cleaned up the interface and moved all settings behind the gear icon ⚙️ in the top right. Everything you're used to is still there: session duration, number of questions, question types, muscle attachments, and more.

Head to any study unit and try it out for yourself. Your next session is one click away. 💪

A paper cut heals like it never happened because your skin cells are constantly growing, copying their DNA, and dividing. This 10-minute video walks through the full cycle.

In this video, you'll learn:

• 🔄 The two main phases: interphase (G1, S, G2) and M phase
• 🧬 How DNA replication works: helicase, polymerase, leading and lagging strands
• 🪜 The 5 stages of mitosis: prophase, prometaphase, metaphase, anaphase, telophase
• ✂️ How cytokinesis splits one cell into two identical daughter cells
• 🛑 How cyclins, CDKs, and checkpoints keep the cycle on track
• 💤 Why some cells rest in G0 and what brings them back

A solid foundation for cell biology, histology, and pathology.

👉 Watch the full video to see each phase in action.

You told us study session quizzes feel slow and repetitive: too many questions on structures you already knew, and not enough movement towards new ones.

We listened, and we've tuned the algorithm to fix exactly that.

Now, when you answer correctly, the quiz moves you ahead faster, so you spend less time on structures you've already nailed. 🚀

And don't worry: When you make mistakes, the quiz will slow down and make sure you really learn it before moving on.

The result is a study session that adapts more closely to what you know, gives you a stronger sense of progress, and doesn't waste your time.

Try a study session, and let us know what you think!

Learn how the body keeps everything balanced and stable—even when conditions change!

In this video, you’ll learn:

• 🌡️ What homeostasis is and why it’s essential for survival
• 🎯 Setpoints, normal ranges & regulated variables
• 🔄 How negative feedback loops maintain stability
• ⚡ How positive feedback loops amplify responses
• 🧠 Key components: sensors, control centers & effectors

From body temperature to oxygen levels, discover how your body stays in control!

👉 Watch the full video to master homeostasis and feedback loops:

Discover how the cell membrane protects, communicates, and controls everything that enters and leaves the cell!

In this video, you’ll learn:

• 🧬 The fluid mosaic model and membrane structure
• 🧪 Roles of lipids, proteins, and carbohydrates
• 🚪 How substances cross the membrane (selective permeability)
• 📡 Cell communication via receptors
• 🧷 Functions like adhesion, support & cell recognition

Understand how this dynamic barrier keeps cells functioning efficiently!

👉 Watch the full video to explore the cell membrane in detail:

We’ve revamped this video with a fresh look, clearer structure, and more engaging storytelling to make learning facial anatomy more fun!

In this updated video, you’ll explore:

• 🧠 The viscerocranium vs. neurocranium
• 😁 Key facial bones (maxilla, mandible, zygomatic & more)
• 👃 Structures forming the nose, orbit & jaw
• 🗣️ How these bones support chewing, speaking & facial expression
• 🛡️ Protection of sensory organs like the eyes and nasal cavity

A must-watch to master the anatomy behind your face!

👉 Rewatch the improved video and explore the facial skeleton!

Uncover how the brain’s layered structure enables complex thinking, movement, and perception!

In this video, you’ll learn:

• 🎂 The 6 layers of the neocortex and their organization
• 🔬 Key staining techniques (Nissl, Golgi, Weigert)
• 🧠 Types of cortical neurons (pyramidal, stellate, fusiform)
• 🔗 How neurons connect within and beyond the cortex
• ⚡ Functional roles of each cortical layer

Perfect for understanding how structure supports brain function!

👉 Watch the full video to explore the cerebral cortex in detail!

This refreshed video brings a clearer structure and more engaging explanations to help you master anatomical orientation with ease!

In this updated video, you’ll learn:

• 🧍 The anatomical position as your reference point
• 🪟 The 3 cardinal planes (sagittal, coronal, transverse)
• 📏 The 3 cardinal axes (horizontal, vertical, sagittal)
• 🔄 How movements relate to planes and axes
• 🧠 How to visualize anatomy like a “body GPS”

Perfect for building a strong foundation in anatomy and movement!

👉 Rewatch the improved video and navigate anatomy with confidence!

We’ve refreshed this classic video with a new look, clearer structure, and more engaging explanations to make learning movement easier than ever!

In this updated video, you’ll explore:

• 🧍 The anatomical position, planes & axes of movement
• 🔁 Major movements (flexion, extension, abduction, adduction, rotation)
• ⚙️ Joint-specific movements (supination, pronation, circumduction & more)
• 🦶 Movements of the wrist, thumb, and ankle
• 🎯 How movements work together in real-life actions

A must-watch upgrade for mastering anatomy fundamentals!

👉 Rewatch the improved video and level up your understanding!

Explore how cells stay organized and efficient with their membrane-bound organelles—each with a specialized role!

In this video, you’ll learn:

• 🧬 What membranous organelles are and why they matter
• ⚡ Mitochondria as the cell’s energy producers (ATP)
• 🧪 Peroxisomes and their role in detoxification
• 🏗️ The endomembrane system (ER, Golgi, lysosomes)
• 📦 How proteins and lipids are modified, sorted & transported
• ♻️ How lysosomes recycle cellular waste

Understand how cells function like highly organized factories!

👉 Watch the full video to master membranous organelles!

Discover how cells act like tiny shipping and distribution centers, controlling what goes in and out to stay alive and functional.

In this video, you’ll learn:

• 🔐 How the cell membrane is selectively permeable
• 🌊 Passive transport: diffusion, facilitated diffusion & osmosis
• ⚡ Active transport and the role of ATP
• 🔄 The sodium-potassium pump and electrochemical gradients
• 📦 Vesicular transport: endocytosis & exocytosis

Build a solid understanding of how cells maintain balance and communicate with their environment!

👉 Watch the full video to master membrane transport!

Meet the command center of the cell! This video dives into the structure and role of the nucleus and why it’s essential for cellular function.

In this video, you’ll learn:

• 🧠 Why the nucleus is called the cell’s “captain”
• 📍 Its typical shape, size, and location in the cell
• 🔁 Variations like multinucleated cells (e.g., skeletal muscle)
• 🧬 How the nucleus stores and manages genetic information
• ⚙️ Its role in coordinating cell activity

A must-watch for understanding how cells stay organized and functional!

👉 Watch the full video to explore the nucleus in detail!

Get a clear and simple overview of the building blocks of life! This video walks you through the essential structure and function of a typical cell.

In this video, you’ll learn:

• 🧫 The 3 main parts of the cell: membrane, nucleus & cytoplasm
• 🔄 How the cell membrane controls what enters and leaves
• 🧬 The role of the nucleus as the cell’s command center
• ⚙️ Key organelles and their functions (mitochondria, ER, Golgi & more)
• ♻️ How cells produce, process, and recycle materials

Perfect for building a strong foundation in cell biology!

👉 Watch the full video to explore how cells function as tiny, powerful factories.

Can you really read faster without losing understanding? Let’s break the myth.

In this Kenhub video, we explore speed reading and what science actually says about it. Why it feels effective, and why it often doesn’t work as promised.

In this video, you’ll discover:

• 📖 How reading really works in the brain
• 🧠 The limits of processing speed
• ⚠️ The “fluency illusion” explained
• ❌ Common speed reading myths
• ✅ What actually improves learning
• 📵 Why distraction is the real problem

👉 Watch the full video on the Kenhub Youtube channel and learn how to truly read smarter!

How do neurons pass information to each other? The answer lies in synapses 🔗

In this Kenhub video, explore the junctions where neurons communicate and learn how signals move from one cell to the next.

In this lesson you'll discover:

• 🧠 What synapses are and how they work

• 🧬 Different types of neuroreceptors

• ⚡ How synaptic transmission occurs

• ➕ How neurons combine signals through summation

👉 Watch the full video on Kenhub and understand how neurons communicate!

How do neurons send signals across the nervous system? It all starts with the action potential ⚡

In this Kenhub video, learn how electrical signals are generated and propagated along neurons to transmit information throughout the body.

In this lesson you’ll explore:

• 🔋 The step-by-step phases of an action potential

• 🧠 How depolarization and repolarization work

• ⚡ How signals travel along axons

• 🏃 Continuous vs. saltatory conduction

👉 Watch the full video on Kenhub and master the fundamentals of neuronal signaling!