Deck 7: Muscle Tissue

Question 1

Which of the following is NOT a structural component of a triad?

A) Myofibril
B) Sarcolemma
C) Sarcoplasmic reticulum
D) Terminal cisterna
E) Transverse tubule

Answer 1

A
Myofibril

Question 2

When comparing skeletal, cardiac, and smooth muscle structure

A) Cardiac muscle contains triads while skeletal muscle contains diads
B) Sarcomere structure in smooth muscle and cardiac muscle are the same
C) Skeletal muscle thin filaments have actin, troponin, and tropomyosin; smooth muscle lacks troponin
D) Skeletal muscles consume more energy than cardiac muscle as a result of the abundance of mitochondria
E) T-tubule diameter in smooth muscle is smaller than in cardiac muscle

Answer 2

C
Skeletal muscle thin filaments have actin, troponin, and tropomyosin; smooth muscle lacks troponin

Question 3

All of the following occur during the contraction of a sarcomere except

A) Shortening of A-band
B) Shortening of H-zone
C) Shortening of I-band.
D) Thin filaments slide toward M-line
E) Z-lines move closer together

Answer 3

A
Shortening of A-band

Question 4

Following stimulation at the neuromuscular junction, Ca²⁺ binds to ____ on thin
Filaments.

A) F-actin
B) G-actin
C) Nebulin 77
D) Tropomyosin
E) Troponin

Question 5

Following the release of acetylcholine at the neuromuscular junction, an action potential travels along the _____ to the interior of the muscle cell.

A) Sarcomere
B) Sarcoplasmic reticulum
C) Thick filament
D) Thin filament
E) Transverse tubule

Question 6

The structure that serves as an attachment for thin filaments and demarcates the boundary between sarcomeres in skeletal muscle is the

A) A band
B) H zone
C) I band
D) M line
E) Z line

Question 7

The H-zone of a sarcomere contains which of the following proteins?

A) Myosin only
B) Actin only
C) Troponin and tropomyosin
D) B and C only
E) All of the above

Question 8

The degree of tension and force in a muscle contraction is monitored by

A) Golgi tendon organs
B) Motor neurons
C) Muscle spindles
D) Nuclear bag fibers
E) Terminal cisternae

Question 9

Connective tissue that surrounds individual muscle cells is called the _____.

A) Endomysium
B) Epimysium
C) Perimysium
D) Sarcolemma
E) Sarcoplasmic reticulum