Neural Control and Coordination Chapter-Wise Test 10

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following best describes saltatory conduction in myelinated neurons?

Impulse jumps from one node of Ranvier to another
Impulse travels continuously along the axon
Impulse conduction is slower in myelinated neurons
Impulse conduction occurs in only one direction
1

Saltatory conduction occurs when the nerve impulse jumps from one node of Ranvier to another, increasing conduction speed.

Which of the following is NOT controlled by the autonomic nervous system?

Heart rate
Digestive functions
Voluntary muscle movement
Pupil dilation
3

Voluntary muscle movement is controlled by the somatic nervous system, whereas the autonomic nervous system regulates involuntary functions.

What is the main function of the myelin sheath around neurons?

To generate neurotransmitters
To increase the speed of nerve impulse conduction
To store electrical energy
To produce action potentials
2

The myelin sheath insulates axons, increasing the speed of impulse conduction through saltatory conduction.

Which of the following correctly describes the function of Nissl’s granules in neurons?

Synthesis of neurotransmitters
Formation of the myelin sheath
Transmission of nerve impulses
Maintaining the resting membrane potential
1

Nissl’s granules are involved in the synthesis of neurotransmitters and proteins in neurons.

Which of the following statements about the parasympathetic nervous system is correct?

It is responsible for the "rest and digest" response.
It increases heart rate and inhibits digestion.
It prepares the body for emergencies.
It does not influence glandular activity.
1

The parasympathetic nervous system slows heart rate, enhances digestion, and promotes energy conservation.

Which of the following statements about synaptic transmission is incorrect?

Neurotransmitters are stored in synaptic vesicles.
Neurotransmitters cross the synaptic cleft to bind to receptors on the postsynaptic membrane.
Neurotransmitters pass freely through the postsynaptic membrane without binding to receptors.
Synaptic transmission can be excitatory or inhibitory.
3

Neurotransmitters must bind to receptors on the postsynaptic membrane to transmit signals; they do not pass freely through the membrane.

Which part of the brain controls the balance and coordination of body movements?

Medulla oblongata
Cerebellum
Thalamus
Hypothalamus
2

The cerebellum is responsible for maintaining balance and coordinating muscle movements.

Which of the following best describes the function of the limbic system?

Controls voluntary muscle movements
Regulates emotions, motivation, and memory
Processes auditory information
Regulates the secretion of digestive enzymes
2

The limbic system is involved in emotional regulation, motivation, and the formation of memories.

Which of the following statements about the autonomic nervous system is correct?

It controls involuntary functions like heart rate and digestion.
It only regulates skeletal muscle movements.
It consists only of the sympathetic nervous system.
It does not influence the endocrine system.
1

The autonomic nervous system regulates involuntary functions such as heart rate, digestion, and glandular secretion.

Which of the following statements about the sodium-potassium pump is incorrect?

It helps maintain the resting membrane potential.
It actively transports sodium (Na⁺) into the neuron and potassium (K⁺) out.
It requires ATP to function.
It plays a role in restoring the ionic balance after an action potential.
2

The sodium-potassium pump transports sodium (Na⁺) out of the neuron and potassium (K⁺) into the neuron, not the other way around.

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