Neural Control and Coordination for NEET UG
Nerves carry messages as electrical impulses and pass them on chemically at synapses. Learn how an impulse is generated, how it crosses a synapse, and what each part of the brain does.
BiologyClass 1175 MCQs2 lessons13 flashcards3 memory tricks
Practise Neural Control and Coordination free
What you'll learn
- The nerve impulse
Explain resting potential, the action potential and how impulses travel. - The brain, reflexes and the eye
Match parts of the brain to their functions and describe a reflex arc.
Memory tricks
At rest, Na⁺ is high outside and K⁺ (bananas are rich in potassium) is high inside; the inside is about −70 mV. The Na⁺/K⁺ pump moves 3 Na⁺ out and 2 K⁺ in.
Rods (rhodopsin) work in dim light; cones work in bright light and give colour vision. The fovea has only cones.
Cerebellum: balance and coordination. Medulla: breathing, heartbeat, swallowing. Hypothalamus: hunger, thirst, temperature, and control of the pituitary.
Try 3 NEET-style questions
Q1. Myelinated nerve fibres are found in
- only the autonomic neural system
- only in the brain's grey matter
- none of the human nerves
- spinal and cranial nerves
Show answer
Answer: (4) spinal and cranial nerves
Myelinated nerve fibres are found in spinal and cranial nerves; unmyelinated fibres are common in the autonomous and somatic neural systems.
Q2. The hypothalamus also contains a group of neurosecretory cells that secrete
- digestive enzymes
- antibodies
- hormones called hypothalamic hormones
- bile
Show answer
Answer: (3) hormones called hypothalamic hormones
The hypothalamus has neurosecretory cells that secrete hypothalamic hormones, which regulate the pituitary.
Q3. The cerebral cortex appears greyish (grey matter) because of the
- myelin sheaths around the axons
- concentration of neuron cell bodies
- many fine blood vessels in it
- cerebrospinal fluid around it
Show answer
Answer: (2) concentration of neuron cell bodies
The cerebral cortex looks grey because the neuron cell bodies are concentrated there.
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