Question 1

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

Accepted Answer

Pumping blood through the cardiovascular system

Question 2

Which property of muscle tissue allows it to return to its original length after being stretched?

Accepted Answer

Elasticity

Question 3

A muscle fascicle is surrounded by which connective tissue layer?

Accepted Answer

Perimysium

Question 4

Which of the following best describes the organization of a skeletal muscle from largest to smallest structure?

Accepted Answer

Muscle → Fascicle → Fiber → Myofibril → Sarcomere

Question 5

During muscle contraction, which band remains the same width?

Accepted Answer

A band

Question 6

Which protein directly binds calcium ions to initiate skeletal muscle contraction?

Accepted Answer

Troponin

Question 7

What is the primary role of the sarcoplasmic reticulum in skeletal muscle fibers?

Accepted Answer

Storage and release of calcium ions

Question 8

A patient is experiencing muscle weakness due to a lack of acetylcholine release at the neuromuscular junction. Which step in muscle contraction is directly affected?

Accepted Answer

Generation of an action potential in the sarcolemma

Question 9

Which of the following best explains why rigor mortis occurs after death?

Accepted Answer

ATP is depleted, preventing detachment of myosin heads from actin

Question 10

Which of the following is a structural difference between cardiac and skeletal muscle cells?

Accepted Answer

Cardiac muscle cells are branched and have a single nucleus

Question 11

Which of the following statements about smooth muscle is TRUE?

Accepted Answer

Smooth muscle cells lack sarcomeres and are non-striated

Question 12

A researcher is studying the effect of a drug that blocks calcium channels in the sarcoplasmic reticulum. Which phase of muscle contraction will be most directly impaired?

Accepted Answer

Release of calcium ions and initiation of contraction

Question 13

Which of the following best describes the role of titin in the sarcomere?

Accepted Answer

It stabilizes thick filaments and helps restore resting sarcomere length

Question 14

Which of the following equations best represents the relationship between muscle tension (T), load (L), and movement (M)?

Accepted Answer

$$T \u003e L \implies M$$

Question 15

Which of the following is a unique feature of cardiac muscle tissue compared to skeletal muscle tissue?

Accepted Answer

Automaticity due to pacemaker cells

Question 16

A patient has a genetic defect that prevents the formation of myosatellite cells. Which process would be most affected?

Accepted Answer

Repair of damaged skeletal muscle fibers

Question 17

Which of the following best explains why smooth muscle can contract even when stretched?

Accepted Answer

Smooth muscle lacks sarcomeres and exhibits plasticity

Question 18

During the contraction cycle, what is the role of ATP in the function of the myosin head?

Accepted Answer

ATP hydrolysis 'cocks' the myosin head and allows detachment from actin

Question 19

Which of the following is a correct sequence of events at the neuromuscular junction leading to muscle contraction?

Accepted Answer

Action potential arrives at axon terminal → Acetylcholine released → Sodium influx at motor end plate → Action potential in sarcolemma

Ch. 10 Notes

Guida di studio - Domande di pratica

Study guide - Flashcard