Neural Control and Coordination Chapter-Wise Test 11

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about neurotransmitters is incorrect?

Neurotransmitters are released from the axon terminal.
Neurotransmitters bind to receptors on the presynaptic membrane.
Neurotransmitters can be excitatory or inhibitory.
Acetylcholine is an example of a neurotransmitter.
2

Neurotransmitters bind to receptors on the postsynaptic membrane, not the presynaptic membrane.

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

The central nervous system processes information and coordinates responses.
The peripheral nervous system consists only of motor neurons.
The autonomic nervous system controls voluntary muscle movements.
The brainstem is not involved in regulating vital functions.
1

The central nervous system (CNS) processes information and coordinates appropriate responses for the body.

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

Impulse travels continuously along the axon
Impulse jumps between nodes of Ranvier
Impulse conduction is slower than unmyelinated neurons
Impulse transmission occurs in both directions
2

Saltatory conduction occurs when nerve impulses jump between nodes of Ranvier, increasing conduction speed.

Which type of glial cell is responsible for forming the myelin sheath in the peripheral nervous system?

Oligodendrocytes
Schwann cells
Astrocytes
Microglia
2

Schwann cells form the myelin sheath around axons in the peripheral nervous system, aiding in faster impulse conduction.

Which nerve fibers carry impulses from the central nervous system to the peripheral organs?

Afferent fibers
Interneurons
Efferent fibers
Sensory neurons
3

Efferent fibers transmit impulses from the CNS to peripheral organs, controlling motor responses.

Which type of conduction occurs in myelinated neurons, allowing impulses to jump between nodes of Ranvier?

Continuous conduction
Chemical conduction
Saltatory conduction
Synaptic transmission
3

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

Which part of the neuron is responsible for receiving signals from other neurons?

Axon
Dendrites
Cell body
Myelin sheath
2

Dendrites receive signals from other neurons and transmit them to the cell body.

Which neurotransmitter is involved in the transmission of nerve impulses across a neuromuscular junction?

Dopamine
Serotonin
Acetylcholine
GABA
3

Acetylcholine is responsible for transmitting signals at neuromuscular junctions.

Which structure of the neuron carries the nerve impulse toward the cell body?

Axon
Dendrites
Synaptic knob
Node of Ranvier
2

Dendrites receive signals from other neurons and transmit them toward the cell body.

Which part of the brainstem helps regulate respiration and heartbeat?

Midbrain
Pons
Medulla oblongata
Cerebellum
3

The medulla oblongata controls vital functions such as respiration and heartbeat.

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