Q: Which equation best represents the transformation of chemical energy to mechanical energy in muscle contraction?

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

Question 1

Which of the following is a unique property of muscle tissue that allows it to respond to electrical stimuli and conduct action potentials along its plasma membrane?

Accepted Answer

Conductivity

Question 2

A patient presents with muscle weakness and inability to generate rapid, forceful contractions. Which type of muscle tissue is most likely affected?

Accepted Answer

Skeletal muscle

Question 3

Which structure within a skeletal muscle fiber is responsible for storing and releasing calcium ions ($\mathrm{Ca^{2+}}$) during muscle contraction?

Accepted Answer

Sarcoplasmic reticulum (SR)

Question 4

During muscle contraction, which protein forms the thick filaments and contains heads that bind to actin?

Accepted Answer

Myosin

Question 5

Which of the following best describes the sarcomere?

Accepted Answer

A region between two successive Z discs

Question 6

A muscle cell is stimulated to contract. Which event occurs first in the sequence of excitation-contraction coupling?

Accepted Answer

Generation of an action potential along the sarcolemma

Question 7

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

Accepted Answer

Hormone secretion

Question 8

Cardiac muscle cells are unique because they:

Accepted Answer

Are striated and involuntary

Question 9

Which of the following correctly matches the muscle type with its location and control?

Accepted Answer

Cardiac muscle – heart, involuntary

Question 10

Which protein stabilizes the structure of the myofibril and resists excessive stretching?

Accepted Answer

Titin

Question 11

A muscle fiber is observed to have a single nucleus, no striations, and is found in the walls of the stomach. Which type of muscle is this?

Accepted Answer

Smooth muscle

Question 12

Which of the following best describes the function of T tubules in skeletal muscle fibers?

Accepted Answer

Conduct electrical impulses deep into the muscle fiber

Question 13

Which of the following is the correct order of organization from smallest to largest within a skeletal muscle?

Accepted Answer

Myofibril → Muscle fiber → Fascicle → Muscle

Question 14

Which of the following statements about skeletal muscle attachments is TRUE?

Accepted Answer

Indirect attachments involve tendons or aponeuroses

Question 15

A researcher is studying the banding pattern of myofibrils. Which band contains only thin filaments?

Accepted Answer

I band

Question 16

Which of the following is a correct description of the molecular structure of thick filaments?

Accepted Answer

Composed of myosin molecules with globular heads

Question 17

Which equation best represents the transformation of chemical energy to mechanical energy in muscle contraction?

Accepted Answer

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

Question 18

Which of the following is a function of the sarcolemma in muscle cells?

Accepted Answer

Conducts electrical signals along the muscle fiber

Question 19

A muscle fiber is observed to have striations, multiple peripheral nuclei, and is under voluntary control. Which type of muscle is this?

Accepted Answer

Skeletal muscle

Question 20

Which of the following statements about the elastic filament titin is correct?

Accepted Answer

It stabilizes the myofibril structure and resists excessive stretching

Muscle Tissue and Physiology: Chapter 10 - Structure and Function

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