Neural Control and Coordination Chapter-Wise Test 19

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about the cerebrum is incorrect?

It controls higher cognitive functions like thinking and learning.
It is divided into two hemispheres.
It does not contain any gray matter.
It is responsible for voluntary muscle control.
3

The cerebrum contains both gray matter and white matter. The gray matter, which forms the cerebral cortex, is involved in processing information.

Which ion is essential for the release of neurotransmitters at a synapse?

Sodium (Na⁺)
Potassium (K⁺)
Calcium (Ca²⁺)
Chloride (Cl⁻)
3

Calcium ions (Ca²⁺) enter the synaptic knob and trigger the release of neurotransmitters into the synaptic cleft.

Which of the following statements about the hypothalamus is correct?

It regulates homeostasis, including body temperature and hunger.
It plays no role in hormone secretion.
It directly controls skeletal muscle movements.
It is responsible for voluntary decision-making.
1

The hypothalamus regulates homeostasis, controlling body temperature, hunger, thirst, and hormonal balance.

Which type of conduction allows nerve impulses to jump between nodes of Ranvier?

Continuous conduction
Chemical conduction
Saltatory conduction
Synaptic transmission
3

Saltatory conduction occurs in myelinated neurons, where impulses jump between nodes of Ranvier, increasing conduction speed.

Which of the following best describes the role of the spinal cord in the nervous system?

Acts as the main site for higher cognitive functions
Connects the peripheral nervous system to the brain
Controls the secretion of hormones
Processes and stores sensory memories
2

The spinal cord acts as a communication link between the peripheral nervous system and the brain while also mediating reflexes.

Which part of the human nervous system acts as the control center for coordination?

Spinal cord
Medulla oblongata
Brain
Cranial nerves
3

The brain acts as the control center for coordination, processing sensory inputs and generating motor responses.

Which of the following neurotransmitters is released at the neuromuscular junction to stimulate muscle contraction?

Dopamine
Acetylcholine
Serotonin
Epinephrine
2

Acetylcholine is released at the neuromuscular junction to stimulate muscle contraction.

Which part of the brain regulates body temperature, hunger, and thirst?

Thalamus
Cerebellum
Hypothalamus
Medulla oblongata
3

The hypothalamus plays a crucial role in regulating body temperature, hunger, thirst, and various homeostatic functions.

Which part of the neuron contains the nucleus and most of the organelles?

Axon
Dendrite
Cell body
Synaptic knob
3

The cell body (or soma) contains the nucleus and most of the neuron's organelles.

Which ion is responsible for depolarization during an action potential?

Potassium (K⁺)
Calcium (Ca²⁺)
Sodium (Na⁺)
Chloride (Cl⁻)
3

During depolarization, sodium ions (Na⁺) enter the neuron, causing a change in membrane potential.

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