Author Capstone Axis

How Kidneys Make Concentrated Urine 🔑 The Counter Current System Henle’s loop and vasa recta work together like a teamwork super-system: 💧 Opposite flows: Filtrate in Henle’s loop limbs moves in opposite directions 🧂 Salty medulla: Osmolarity increases from cortex (300 mOsmol/L) → inner medulla (1200 mOsmol/L) due to NaCl & urea 🔄 How it

Excretion Notes 🌱 Biology Notes: Excretion Beyond Kidneys Here’s how different organs help remove waste from your body! 😊 💦 Urine Basics Micturition: The process of releasing urine Bladder muscles contract 🌀 Urethral sphincter relaxes ⬇️ Controlled by micturition reflex Daily urine output: 1-1.5 liters (adults) Urine properties: Light yellow, watery 💛 Slightly acidic (pH

Excretory Products and Their Elimination When your bladder fills up, smooth muscles contract while the urethral sphincter relaxes, letting urine flow out. This process is called micturition (or peeing!), and the nerves controlling it form the micturition reflex 🧠. Fun urine facts 💛: Adults make 1–1.5 liters of urine daily. It’s light yellow, slightly acidic

Muscles: Our Body’s Movers and Shakers 💪 What Makes Us Move? Our body has special movement superpowers: 🦠 Amoeboid movement: Macrophages and white blood cells crawl like Amoeba using “fake feet” (pseudopodia)! 🌬️ Ciliary movement: Tiny hair-like structures (cilia) in our windpipe sweep out dust. They also help move eggs in the female reproductive tract!

What Are Joints? Joints are connection points between bones (or bones and cartilage) that help us move. Muscles create force to move these joints, which act like levers! 🔧 Different joints allow different amounts of movement. 3 Types of Joints: Fibrous Joints: ❌ No movement allowed. Example: Skull bones fused by dense fibrous tissue (sutures).

Neural System Notes 🧠 Neural Control and Coordination 18.1 Neural System All animals have a neural system made of special cells called neurons 🧪 Neurons can detect, receive, and transmit different stimuli (signals) ⚡ Simple invertebrates (like Hydra 🪸) have a basic network of neurons Insects 🐜 have a better-organized system with a brain +

🧠 Human Neural System: Control & Coordination ⭐ Key NEET Concepts CNS vs. PNS: Central (brain + spinal cord) vs. Peripheral (all body nerves) Nerve Fibre Types: Afferent (body → CNS) vs. Efferent (CNS → body) PNS Divisions: Somatic (voluntary muscles) & Autonomic (involuntary organs) Autonomic Subtypes: Sympathetic & Parasympathetic systems Neuron Structure: Cell body

Neuron: The Building Block of Your Nervous System 🧠 Neurons are special cells that detect, receive, and send signals in your body. They’re the structural and functional units of your nervous system! 🧩 Parts of a Neuron Cell body: The control center with cytoplasm, nucleus, and Nissl’s granules (special protein-making granules). Dendrites: Branch-like structures carrying