Question 1

Which of the following best describes the role of the sarcomere in skeletal muscle contraction?

Accepted Answer

It is the structural unit where actin and myosin filaments slide past each other to produce contraction.

Question 2

During the recovery period after intense exercise, which process helps restore muscle energy reserves?

Accepted Answer

Conversion of lactic acid to glucose in the liver via the Cori cycle ($$C_3H_6O_3 \rightarrow C_6H_{12}O_6$)

Question 3

Which of the following is a function of the sodium-potassium pump in maintaining the resting membrane potential of a neuron?

Accepted Answer

It actively transports $$3$$ sodium ions out and $$2$$ potassium ions into the cell, maintaining a negative internal charge.

Question 4

A patient presents with muscle weakness and delayed-onset muscle soreness after exercise. Which muscle fiber type is most likely to be affected?

Accepted Answer

Type IIb (fast-twitch, white fibers)

Question 5

Which equation correctly represents the relationship between mechanical advantage ($$MA$$), effort arm ($$EA$$), and resistance arm ($$RA) in a $$lever system?

Accepted Answer

$$MA = \frac{EA}{RA}$$

Question 6

Which neurotransmitter is primarily released at the neuromuscular junction to initiate skeletal muscle contraction?

Accepted Answer

Acetylcholine

Question 7

A patient with damage to the axon terminal of a motor neuron would most likely experience which of the following?

Accepted Answer

Impaired release of neurotransmitters, leading to reduced muscle contraction

Question 8

Which of the following best describes the difference between isotonic and isometric muscle contractions?

Accepted Answer

Isotonic contractions involve muscle length change, while isometric contractions involve tension without length change.

Question 9

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

Accepted Answer

Oligodendrocytes

Question 10

A person is unable to perform lateral excursion of the jaw. Which muscle group is most likely impaired?

Accepted Answer

Medial and lateral pterygoid muscles

Question 11

Which of the following best explains the effect of increased axon diameter on the speed of action potential propagation?

Accepted Answer

Larger axon diameter decreases resistance and increases propagation speed.

Question 12

Which of the following is a correct description of the absolute refractory period in a neuron?

Accepted Answer

A period when voltage-gated sodium channels are inactivated and no new action potential can be generated.

Question 13

Which of the following best describes the function of a G-protein coupled receptor (GPCR) in neuronal signaling?

Accepted Answer

It activates intracellular signaling cascades via second messengers after ligand binding.

Question 14

Which equation represents the calculation of cardiac output ($$CO) in $$terms of heart rate ($$HR) $$and stroke volume ($$SV$$)?

Accepted Answer

$$CO = HR 	imes SV$$

Question 15

Which of the following best describes the process of rigor mortis?

Accepted Answer

Muscle stiffness after death caused by lack of ATP, preventing detachment of myosin from actin

Question 16

Which of the following is a correct description of the effect of hormones on skeletal muscle?

Accepted Answer

Testosterone and growth hormone stimulate muscle protein synthesis and hypertrophy.

Question 17

Which of the following best describes the difference between smooth and skeletal muscle fibers?

Accepted Answer

Skeletal muscle fibers are striated and voluntary, while smooth muscle fibers are non-striated and involuntary.

Question 18

Which of the following is a correct description of the function of the effector organ in a reflex arc?

Accepted Answer

It carries out the response to the motor neuron signal.

Question 19

Which of the following best describes the role of titin in muscle fibers?

Accepted Answer

Titin acts as a molecular spring, maintaining sarcomere structure and elasticity.

Question 20

Which of the following is a correct description of the function of the axoaxonic synapse?

Accepted Answer

It modulates neurotransmitter release from the presynaptic neuron, affecting synaptic transmission.

Muscle Tissue, Muscular System, and Nervous Tissue: Study Guide for Anatomy & Physiology

Guida di studio - Domande di pratica

Study guide - Flashcard