Q: Which equation correctly represents the immediate source of energy for muscle contraction?

$$\mathrm{ATP} \rightarrow \mathrm{ADP} + \mathrm{P_i} + \text{energy}$$

Question 1

Which of the following is NOT a primary function of skeletal muscle tissue?

Accepted Answer

Hormone secretion

Question 2

The connective tissue layer that surrounds an individual muscle fiber is called:

Accepted Answer

Endomysium

Question 3

Which protein is responsible for covering the active sites on G-actin in a resting muscle?

Accepted Answer

Tropomyosin

Question 4

During muscle contraction, which event directly follows the binding of calcium to troponin?

Accepted Answer

Exposure of active sites on actin

Question 5

Which of the following best describes the sliding filament theory?

Accepted Answer

Thin filaments slide toward the center of the sarcomere, causing muscle contraction

Question 6

A sarcomere is defined as the region between:

Accepted Answer

Two Z-lines

Question 7

Which equation correctly represents the immediate source of energy for muscle contraction?

Accepted Answer

$$\mathrm{ATP} ightarrow \mathrm{ADP} + \mathrm{P_i} + 	ext{energy}$$

Question 8

Which structure is responsible for transmitting the action potential deep into the muscle fiber?

Accepted Answer

T tubules

Question 9

A patient presents with muscle weakness and rapid fatigue. Laboratory tests show a decrease in creatine phosphate levels. Which metabolic pathway is most likely impaired?

Accepted Answer

Phosphorylation of ADP by creatine phosphate

Question 10

Which of the following statements about cardiac muscle cells is TRUE?

Accepted Answer

They contain intercalated discs for electrical and mechanical connection

Question 11

Which of the following best explains why muscle tone is important?

Accepted Answer

It maintains posture and stabilizes joints even at rest

Question 12

Which of the following is a characteristic unique to smooth muscle cells?

Accepted Answer

Single, centrally located nucleus

Question 13

What is the role of titin in the sarcomere?

Accepted Answer

It helps the sarcomere return to its resting length after contraction

Question 14

Which of the following best describes the process of excitation-contraction coupling?

Accepted Answer

Action potential triggers calcium release, leading to muscle contraction

Question 15

Which of the following is TRUE regarding motor units?

Accepted Answer

A motor unit consists of one motor neuron and all the muscle fibers it controls

Question 16

Which of the following best describes muscle hypertrophy?

Accepted Answer

Increase in muscle fiber size due to repeated stimulation

Question 17

Which of the following events occurs during the power stroke of muscle contraction?

Accepted Answer

Myosin head pivots, pulling actin toward the center of the sarcomere

Question 18

Which equation represents the regeneration of ATP from creatine phosphate?

Accepted Answer

$$\mathrm{Creatine~Phosphate} + \mathrm{ADP} \rightarrow \mathrm{Creatine} + \mathrm{ATP}$$

Question 19

Which of the following is a consequence of muscle fatigue?

Accepted Answer

Decreased ability to respond to stimulation

Question 20

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

Accepted Answer

Isotonic contractions involve muscle shortening or lengthening with constant tension

Muscle Tissue & Physiology: Structure and Function

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