Free Coordination and Control MCQs with Answers

• A. The darkening of skin in lower vertebrates
• B. The light colouration of skin in lower vertebrates
• C. both A and B
• D. The darkening of skin in human beings

Explanation: Pars intermedia is the boundary between the anterior and posterior lobes of the pituitary. It contains three types of cells, i.e.

• A. Musculo-skeletal system
• B. Nervous system
• C. Respiratory system
• D. Cardiovascular system

Explanation: Ectoderm mainly gives rise to nervous system and integumentary systems while mesoderm give rise to all other tissues of the body…

• A. Spinal nerves to effectors
• B. Effectors to cranial nerves
• C. Effectors to CNS
• D. CNS to effectors

Explanation: Efferent neurons are meant to conduct messages from CNS to the effectors as they are emerging from CNS.

• A. For each sensation, different form of nerve impulse is generated
• B. Different receptors are present for detection of stimuli
• C. All nerves send their impulse to same part of brain
• D. Each stimulus acts on different parts of body

Explanation: Stimuli are always detected by specific receptors present in different parts of the body.

• A. Paccinian's corpuscles
• B. Mechanoreceptors
• C. Merkel disks
• D. Both B and C

Explanation: Merkel disks are touch receptors. Receptors for touch and pressure are also called mechanoreceptors.

• A. Is found in all axons
• B. ls found in all dendrites
• C. Speeds up conduction
• D. Is proteinaceous

Explanation: Is proteinaceous The myelin sheath is a proteinaceous substance, which means that it is made up of proteins.

• A. Sensory neurons
• B. Associative neurons
• C. Motor neurons
• D. Mixed neurons

Explanation: Motor neurons are also known as efferent neurons.Efferent neurons are neurons that carry signals away from the central nervous system…

• A. Mitochondria
• B. Ribosomes
• C. Secretory vesicles
• D. Nucleus

Explanation: The organelle that cannot be found in the synaptic knob of a neuron is the nucleus.The synaptic knob is the bulbous end of a presynaptic…

• A. Prick on finger → Sensory nerve → Medulla → Motor nerve → Arm Muscle
• B. Prick on finger → Sensory nerve → Spinal cord → Motor nerve → Finger muscles
• C. Prick on finger → Sensory nerve → Cerebrum → Motor nerve → Finger muscles
• D. Prick on finger → Sensory nerve → Cerebellum → Motor nerve → Finger muscles

Explanation: The simplest arrangement of a reflex are consists of the receptors, an interneuron, and an effector; together these units from a…

• A. Influx of K+
• B. Influx of Na+
• C. Efflux of K+
• D. Efflux of Na+

Explanation: The influx of Na+ increases the concentration of positively charged ions in the cell and causes depolarization, where the potential of the…

• A. Distribution of charge
• B. Influx of Na+
• C. Late closing of K+ channels
• D. Outward diffusion of Na+

Explanation: Hyperpolarization is a change in a cell's membrane potential that makes it more negative. It is the opposite to that of a depolarization.

• A. K+ channels
• B. Na+/K+ pumps
• C. Na+ channels
• D. Ca2+ channels

Explanation: In neurolemma, a specialized ATP dependant Na+/K+ pump is present which will restore original ion gradient and hence the resting membrane…

• A. Depolarization
• B. Repolarization
• C. Polarization
• D. Hyperpolarization

Explanation: The explanation is given below. SEE GRAPH, Point 2 depicts 'depolarization'.

• A. Repolarization
• B. The action of the acetylcholinesterase enzyme
• C. The opening of sodium channels/gates
• D. Sodium ions forming an ionic bonding

Explanation: In an action potential, the permeability of sodium ions increases due to the opening of sodium channels or gates in the neuron's membrane.

• A. Depolarization
• B. Resting membrane potential
• C. Repolarization
• D. Hyperpolarization

Explanation: This phase of an action potential involves the return of the membrane potential to its resting state after depolarization.

• A. Option A
• B. Option B
• C. Option C
• D. Option D

Explanation: During resting membrane potential, membrane will be highly positive from outside and highly negative from inside.

• A. Calcium
• B. Potassium
• C. Sodium
• D. Magnesium

Explanation: Calcium ions (Ca2+) are involved in the release of neurotransmitters, including acetylcholine, from the presynaptic neuron into the…

• A. Taken up by Schwann cells
• B. Remain in synaptic cleft
• C. Degraded by enzymes
• D. Taken up by post synaptic membrane

Explanation: Neurotransmitters that have been released into the synaptic cleft are often degraded by specific enzymes present in the cleft.

• A. Sodium
• B. Potassium
• C. Protein
• D. Calcium

Explanation: Calcium ions (Ca2+) are required for the transfer of impulses from the presynaptic neuron to the postsynaptic neuron.

• A. Resting membrane potential
• B. Threshold stimulus
• C. Saltatory nerve impulse
• D. lnitial nerve impulse

Explanation: The correct term for the nerve impulse that jumps from node to node in myelinated neurons is the "saltatory nerve impulse." In myelinated…