Question 1

Match the sarcomere component with the correct characteristic by using the answer code (options may be used more than once or not at all).
-runs down the middle of the A band

Accepted Answer

The H zone is the region within the A band of a sarcomere that runs down the middle and is lighter in appearance because it only contains thick filaments (myosin) and no thin filaments (actin).

Question 2

Match the sarcomere component with the correct characteristic by using the answer code (options may be used more than once or not at all).
-joins adjacent sarcomeres together

Accepted Answer

The Z line marks the boundaries of each sarcomere and joins adjacent sarcomeres together.

Question 3

MATCHING
Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by using the following code (options may be used more than once or not at all).
-has (have)ATPase capacity

Accepted Answer

Myosin is the motor protein in muscle cells that has ATPase activity, which means it can hydrolyze ATP to ADP and inorganic phosphate, providing the energy necessary for muscle contraction. Actin, troponin, and tropomyosin do not have ATPase activity.

Question 4

MATCHING
Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by using the following code (options may be used more than once or not at all).
-lie(s)near the groove of the thin filament helix

Accepted Answer

The troponin-tropomyosin complex lies near the groove of the thin filament helix.

Question 5

Indicate which bands are being described in each statement by writing the appropriate letter(s) in the blank by using the answer code (options may be used more than once or not at all).
-remains the same size during muscle contraction

Accepted Answer

The A band remains the same size during muscle contraction, as it contains thick filaments (myosin) that do not change in size.

Question 6

Indicate which bands are being described in each statement by writing the appropriate letter(s) in the blank by using the answer code (options may be used more than once or not at all).
-shortens during muscle contraction

Accepted Answer

The answer of Indicate which bands are being described in...

Question 7

Indicate which bands are being described in each statement by writing the appropriate letter(s) in the blank by using the answer code (options may be used more than once or not at all).
-composed of thin filaments only

Accepted Answer

The I band is composed of thin filaments only, while the A band contains both thin and thick filaments, and the H zone contains thick filaments only.

Question 8

Match the sarcomere component with the correct characteristic by using the answer code (options may be used more than once or not at all).
-dark band

Accepted Answer

The answer of Match the sarcomere component with the correct...

Question 9

Match the sarcomere component with the correct characteristic by using the answer code (options may be used more than once or not at all).
-contains partially overlapping thick and thin filaments

Accepted Answer

The A band is the region of the sarcomere that contains partially overlapping thick and thin filaments. This area remains constant in length during muscle contraction and relaxation, distinguishing it by its density in electron micrographs.

Question 10

MATCHING
Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by using the following code (options may be used more than once or not at all).
-found in the sarcomere

Accepted Answer

All of the proteins listed are found in the sarcomere of skeletal muscle, with actin and myosin being the main contractile proteins, and troponin and tropomyosin regulating their interaction. Therefore, the best choice is F, which includes all of the proteins listed.

Question 11

MATCHING
Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by using the following code (options may be used more than once or not at all).
-shape consists of two globular heads attached to a tail

Accepted Answer

The shape consisting of two globular heads attached to a tail is a characteristic of the myosin protein, which is responsible for the actual muscle contraction in skeletal muscle.

Question 12

MATCHING
Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by using the following code (options may be used more than once or not at all).
-found in thick filament

Accepted Answer

Myosin is the main protein found in the thick filament of skeletal muscle.

Question 13

Indicate which bands are being described in each statement by writing the appropriate letter(s) in the blank by using the answer code (options may be used more than once or not at all).
-composed of thick and thin filaments

Accepted Answer

The A band is composed of thick and thin filaments, whereas the I band only contains thin filaments and the H zone only contains thick filaments.

Question 14

Match the sarcomere component with the correct characteristic by using the answer code (options may be used more than once or not at all).
-contains only thin filaments

Accepted Answer

The I band contains only thin filaments (actin).

Answer: B, D
 The A band contains both thick and thin filaments (myosin and actin), while the H zone contains only thick filaments (myosin). The Z line marks the boundary between adjacent sarcomeres.

Question 15

MATCHING
Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by using the following code (options may be used more than once or not at all).
-can bind with Ca²⁺ during contraction

Accepted Answer

The troponin-tropomyosin complex is responsible for regulating muscle contraction by blocking the actin-myosin interaction when calcium ions are not present. When calcium binds to the troponin-tropomyosin complex, the complex changes shape and allows the myosin to interact with the actin, leading to muscle contraction. Therefore, option D is the correct choice.

Question 16

MATCHING
Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by using the following code (options may be used more than once or not at all).
-can bind with myosin during muscle contraction

Accepted Answer

Actin is the protein that myosin binds to during muscle contraction, allowing the muscle to contract as myosin heads attach to actin filaments and pull them closer together.

Question 17

Indicate which bands are being described in each statement by writing the appropriate letter(s) in the blank by using the answer code (options may be used more than once or not at all).
-composed of thick filaments only

Accepted Answer

The answer of Indicate which bands are being described in...

Question 18

Match the sarcomere component with the correct characteristic by using the answer code (options may be used more than once or not at all).
-light band

Accepted Answer

The answer of Match the sarcomere component with the correct...

Question 19

MATCHING
Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by using the following code (options may be used more than once or not at all).
-form(s)a helical chain

Accepted Answer

Actin forms a helical chain in the structure of muscle fibers, which is essential for muscle contraction.

Question 20

Match the sarcomere component with the correct characteristic by using the answer code (options may be used more than once or not at all).
-contains only thick filaments

Accepted Answer

The A band contains both thick and thin filaments, but the H zone within it contains only thick filaments. The other options (Z line, I band) do not contain thick filaments.

Quiz 6: Muscle Physiology

Match the sarcomere component with the correct characteristic by using the answer code (options may be used more than once or not at all) . -runs down the middle of the A band

Match the sarcomere component with the correct characteristic by using the answer code (options may be used more than once or not at all) . -joins adjacent sarcomeres together

MATCHING Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by using the following code (options may be used more than once or not at all) . -has (have) ATPase capacity

MATCHING Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by using the following code (options may be used more than once or not at all) . -lie(s) near the groove of the thin filament helix

Indicate which bands are being described in each statement by writing the appropriate letter(s) in the blank by using the answer code (options may be used more than once or not at all) . -remains the same size during muscle contraction

Indicate which bands are being described in each statement by writing the appropriate letter(s) in the blank by using the answer code (options may be used more than once or not at all) . -shortens during muscle contraction

Indicate which bands are being described in each statement by writing the appropriate letter(s) in the blank by using the answer code (options may be used more than once or not at all) . -composed of thin filaments only

Match the sarcomere component with the correct characteristic by using the answer code (options may be used more than once or not at all) . -dark band

Match the sarcomere component with the correct characteristic by using the answer code (options may be used more than once or not at all) . -contains partially overlapping thick and thin filaments

MATCHING Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by using the following code (options may be used more than once or not at all) . -found in the sarcomere

MATCHING Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by using the following code (options may be used more than once or not at all) . -shape consists of two globular heads attached to a tail

MATCHING Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by using the following code (options may be used more than once or not at all) . -found in thick filament

Indicate which bands are being described in each statement by writing the appropriate letter(s) in the blank by using the answer code (options may be used more than once or not at all) . -composed of thick and thin filaments

Match the sarcomere component with the correct characteristic by using the answer code (options may be used more than once or not at all) . -contains only thin filaments

MATCHING Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by using the following code (options may be used more than once or not at all) . -can bind with Ca²⁺ during contraction

MATCHING Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by using the following code (options may be used more than once or not at all) . -can bind with myosin during muscle contraction

Indicate which bands are being described in each statement by writing the appropriate letter(s) in the blank by using the answer code (options may be used more than once or not at all) . -composed of thick filaments only

Match the sarcomere component with the correct characteristic by using the answer code (options may be used more than once or not at all) . -light band

MATCHING Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by using the following code (options may be used more than once or not at all) . -form(s) a helical chain

Match the sarcomere component with the correct characteristic by using the answer code (options may be used more than once or not at all) . -contains only thick filaments