Q: Which equation best represents the ATP hydrolysis that powers muscle contraction?

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

Question 1

Which of the following best describes the primary distinguishing feature of skeletal muscle tissue compared to cardiac and smooth muscle?

Accepted Answer

It is under voluntary control.

Question 2

Which function of muscle tissue is most directly responsible for maintaining body temperature after exposure to cold?

Accepted Answer

Generating heat through contractions

Question 3

A patient is unable to voluntarily move their arm but can still feel involuntary muscle contractions in their digestive tract. Which muscle types are affected and unaffected?

Accepted Answer

Skeletal muscle affected; smooth muscle unaffected

Question 4

Which connective tissue sheath surrounds an individual muscle fiber?

Accepted Answer

Endomysium

Question 5

What is the functional (contractile) unit of a skeletal muscle fiber?

Accepted Answer

Sarcomere

Question 6

During the sliding filament model of muscle contraction, which event occurs first?

Accepted Answer

Calcium ions bind to troponin, exposing binding sites on actin

Question 7

Which of the following is TRUE regarding the microscopic anatomy of a skeletal muscle fiber?

Accepted Answer

It has multiple nuclei located peripherally.

Question 8

Which term refers to the cell membrane of a muscle fiber?

Accepted Answer

Sarcolemma

Question 9

A muscle fiber is observed to have branching chains of cells, a single central nucleus, and intercalated discs. Which type of muscle tissue is this?

Accepted Answer

Cardiac muscle

Question 10

Which of the following best explains why skeletal muscle fibers contain many mitochondria?

Accepted Answer

They require large amounts of ATP for sustained contraction.

Question 11

Which of the following is a thick filament in the sarcomere?

Accepted Answer

Myosin

Question 12

Which equation best represents the ATP hydrolysis that powers muscle contraction?

Accepted Answer

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

Question 13

Which muscle tissue type is responsible for pumping blood throughout the body?

Accepted Answer

Cardiac muscle

Question 14

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

Accepted Answer

Production of hormones

Question 15

Which of the following best describes the arrangement of sarcomeres in a myofibril?

Accepted Answer

Sarcomeres are arranged in series, end-to-end.

Question 16

Which of the following muscle characteristics is unique to muscle tissue and not found in other tissues?

Accepted Answer

Contractility

Question 17

A person is able to voluntarily flex their biceps but cannot control the contraction of their heart muscle. Which statement is correct?

Accepted Answer

Skeletal muscle is voluntary; cardiac muscle is involuntary.

Question 18

Which of the following best describes the role of troponin in muscle contraction?

Accepted Answer

Troponin binds calcium ions, causing tropomyosin to move and expose actin binding sites.

Question 19

Which of the following is the correct order of events in the sliding filament model of muscle contraction?

Accepted Answer

Calcium binds to troponin, tropomyosin moves, myosin binds to actin, power stroke occurs

Question 20

Which of the following best explains why smooth muscle is found in the walls of hollow organs?

Accepted Answer

It contracts involuntarily to move substances through the organ.

Muscles and Muscle Tissue: Structure, Function, and Types

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