Q: Which equation correctly represents the relationship between force, muscle cross-sectional area, and muscle fiber type?

$$F = CSA \times \text{fiber efficiency}$$

Question 1

Which of the following best describes the function of acetylcholine at the neuromuscular junction?

Accepted Answer

It stimulates muscle contraction by binding to receptors on the sarcolemma.

Question 2

A patient presents with muscle weakness and fatigue. Blood tests reveal low levels of calcium. Which physiological process is most likely impaired?

Accepted Answer

Binding of troponin to tropomyosin, allowing actin-myosin interaction.

Question 3

Which equation correctly represents the relationship between force, muscle cross-sectional area, and muscle fiber type?

Accepted Answer

$$F = CSA 	imes 	ext{fiber efficiency}$$

Question 4

During a cadaver lab, you observe the sciatic nerve running posteriorly in the lower limb. Which muscle does this nerve primarily innervate?

Accepted Answer

Hamstrings

Question 5

Which of the following best explains why cardiac muscle cells are able to contract in a coordinated manner?

Accepted Answer

They contain gap junctions that allow electrical signals to pass directly between cells.

Question 6

A person suffers a spinal cord injury at the level of the cervical vertebrae. Which of the following functions is most likely to be affected?

Accepted Answer

Movement of the lower limbs

Question 7

Which formula represents the calculation of membrane potential using ion concentrations?

Accepted Answer

$$V_m = \frac{RT}{F} \ln \left( \frac{[K^+]_{out}}{[K^+]_{in}} \right)$$

Question 8

Which scenario best illustrates the principle of antagonistic muscle action?

Accepted Answer

The biceps brachii contracts while the triceps brachii relaxes during elbow flexion.

Question 9

A patient is diagnosed with myasthenia gravis, an autoimmune disorder affecting the neuromuscular junction. Which of the following is most likely to occur?

Accepted Answer

Decreased number of functional acetylcholine receptors on the muscle membrane.

Question 10

Which equation best describes the relationship between muscle tension, load, and velocity of contraction?

Accepted Answer

$$V = V_{max} \left( 1 - \frac{L}{T_{max}} \right)$$

Question 11

Which of the following is a direct result of the influx of sodium ions during the action potential in a neuron?

Accepted Answer

Depolarization of the membrane

Question 12

A cadaver specimen shows damage to the facial nerve. Which function is most likely impaired?

Accepted Answer

Facial expression

Question 13

Which of the following best describes the sliding filament theory of muscle contraction?

Accepted Answer

Actin filaments slide past myosin filaments, causing sarcomere shortening.

Question 14

Which formula represents the calculation of cardiac output?

Accepted Answer

$$CO = HR 	imes SV$$

Question 15

A patient with a lesion in the occipital lobe is most likely to experience which deficit?

Accepted Answer

Impaired vision

Question 16

Which of the following best explains the role of ATP in muscle contraction?

Accepted Answer

ATP provides energy for the detachment of myosin heads from actin.

Question 17

Which equation represents the calculation of blood pressure using cardiac output and peripheral resistance?

Accepted Answer

$$BP = CO 	imes PR$$

Question 18

A patient is unable to dorsiflex the foot after a lower limb injury. Which nerve is most likely damaged?

Accepted Answer

Common peroneal (fibular) nerve

Question 19

Which of the following best describes the function of the cerebellum?

Accepted Answer

Coordination of voluntary movements and balance

Question 20

Which formula represents the calculation of the refractory period in a neuron?

Accepted Answer

$$RP = \frac{1}{f}$$

BIO 141 Exam 3 Study Guide: Muscular and Nervous Systems

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