$$32 \, \text{ATP} / \text{glucose}$$

$$F \propto N_{\text{motor units}}$$

Question 1

Which of the following is NOT a shared characteristic of all muscle tissue types?

Accepted Answer

Secretion – ability to release hormones

Question 2

A patient is unable to move their arm after a nerve injury. Which property of muscle tissue is most directly affected?

Accepted Answer

Excitability

Question 3

Which connective tissue wrapping surrounds individual muscle fibers?

Accepted Answer

Endomysium

Question 4

During a biceps curl, which muscle acts as the antagonist?

Accepted Answer

Triceps brachii

Question 5

Which statement best describes the origin of a skeletal muscle?

Accepted Answer

It is the stationary attachment, serving as the anchor.

Question 6

What is the correct order of organization from largest to smallest in skeletal muscle tissue?

Accepted Answer

Muscle → Fascicle → Muscle fiber → Myofibril

Question 7

Which type of muscle tissue is striated, has multiple nuclei, and is under voluntary control?

Accepted Answer

Skeletal muscle

Question 8

If a muscle is unable to relax after contraction, which process is most likely impaired?

Accepted Answer

Active transport of calcium ions back into the sarcoplasmic reticulum

Question 9

Which equation correctly represents the ATP yield from aerobic respiration of one glucose molecule in muscle cells?

Accepted Answer

$$32 \, 	ext{ATP} / 	ext{glucose}$$

Question 10

A sprinter relies on which type of muscle fibers for explosive power?

Accepted Answer

Fast-twitch fibers

Question 11

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

Accepted Answer

T (transverse) tubules

Question 12

What is the role of acetylcholine (ACh) at the neuromuscular junction?

Accepted Answer

It generates an action potential in the muscle cell.

Question 13

Which muscle contraction type occurs when tension increases but the muscle does not change length?

Accepted Answer

Isometric contraction

Question 14

A muscle fiber is unable to form crossbridges during contraction. Which protein is most likely blocking the myosin-binding sites?

Accepted Answer

Tropomyosin

Question 15

Which of the following best explains why cardiac muscle is highly fatigue-resistant?

Accepted Answer

It utilizes many energy sources and has numerous mitochondria.

Question 16

Which equation best represents the relationship between force of contraction and number of motor units activated?

Accepted Answer

$$F \propto N_{	ext{motor units}}$$

Question 17

Which muscle tissue type is involuntary, non-striated, and has spindle-shaped cells?

Accepted Answer

Smooth muscle

Question 18

Which process directly requires ATP during muscle relaxation?

Accepted Answer

Active transport of calcium ions into the sarcoplasmic reticulum

Question 19

A muscle that has decreased in size due to disuse is experiencing which process?

Accepted Answer

Atrophy

Question 20

Which of the following is true regarding the insertion of a muscle?

Accepted Answer

It moves toward the origin during contraction.

The Muscular System: Structure and Function of Muscular Tissue

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