Q: Which of the following is a property of A$$eta$$ fibers compared to C fibers in sensory transmission?

A$$eta$$ fibers are myelinated and transmit touch and pressure signals rapidly.

Question 1

Which of the following best describes the function of a sensory receptor in the somatosensory system?

Accepted Answer

To convert a specific type of environmental stimulus into a change in membrane potential.

Question 2

A patient suffers a right dorsal cord injury at thoracic level 6. Which sensory deficit would you expect below the level of injury?

Accepted Answer

Loss of fine touch and vibration on the right side.

Question 3

Which pathway is primarily responsible for transmitting pain and temperature information to the brain?

Accepted Answer

Spinothalamic pathway

Question 4

How do sensory neurons code for the intensity of a stimulus?

Accepted Answer

By increasing the frequency of action potentials and recruiting more neurons.

Question 5

Which of the following is a characteristic of rapidly adapting (phasic) receptors?

Accepted Answer

They respond only to the onset and offset of a stimulus.

Question 6

Which receptor type is responsible for detecting vibration in the skin?

Accepted Answer

Pacinian corpuscle

Question 7

What is the functional significance of a motor unit?

Accepted Answer

It is the smallest unit of force production in the neuromuscular system.

Question 8

Which of the following best describes the sequence of events in the crossbridge cycle during muscle contraction?

Accepted Answer

Myosin binds to actin, performs a power stroke, releases ADP, and then binds ATP to detach.

Question 9

Which of the following is true regarding the regulation of the crossbridge cycle in skeletal muscle?

Accepted Answer

Calcium binds to troponin, causing tropomyosin to expose myosin-binding sites on actin.

Question 10

Which of the following mechanisms is responsible for the removal of calcium from the cytosol to terminate muscle contraction?

Accepted Answer

Ca$$^{2+}$$ ATPase in the sarcoplasmic reticulum

Question 11

Which of the following best explains the 'gate-control theory' of pain modulation?

Accepted Answer

Non-painful mechanical stimuli can inhibit pain transmission at the spinal cord level.

Question 12

Which of the following is a property of A$$eta$$ fibers compared to C fibers in sensory transmission?

Accepted Answer

A$$eta$$ fibers are myelinated and transmit touch and pressure signals rapidly.

Question 13

Which of the following is a correct statement about the monosynaptic stretch reflex?

Accepted Answer

It involves direct activation of motor neurons by 1a afferents from muscle spindles.

Question 14

Which of the following best describes the order of motor unit recruitment according to Henneman’s Size Principle?

Accepted Answer

Small, slow, fatigue-resistant units are recruited first.

Question 15

Which of the following is a distinguishing feature of the Golgi tendon organ (GTO)?

Accepted Answer

It detects changes in muscle tension.

Question 16

A patient presents with a loss of vibration and fine touch sensation below the level of a spinal cord lesion, but pain and temperature sensation are preserved. Which pathway is most likely damaged?

Accepted Answer

Dorsal column-medial lemniscal pathway

Question 17

Which of the following is true regarding the adaptation of sensory receptors?

Accepted Answer

Rapidly adapting receptors respond at the onset and offset of a stimulus.

Question 18

Which of the following best describes the role of lateral inhibition in sensory processing?

Accepted Answer

It enhances the localization of a stimulus by inhibiting neighboring neurons.

Question 19

Which of the following is a correct sequence of events in excitation-contraction coupling in skeletal muscle?

Accepted Answer

Action potential in muscle fiber → Ca$$^{2+}$$ release from sarcoplasmic reticulum → Crossbridge cycling → Muscle contraction

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