08 Jan Acetylcholinesterase

BSC2346 Human Anatomy and Physiology

Module 04 Quiz

Question 1

What statement is true of smooth muscle?

Answers:

It has a striated appearance when viewed under a microscope

Its contraction is controlled by the same mechanism as skeletal muscle

It only contracts through conscious control

It is found mainly within internal organs such as the bladder and uterus

Question 2

Which statement is NOT true regarding muscle contraction?

Answers:

Calcium ions bind to the tropomyosin protein

The thick filament is composed of the myosin protein

The sarcoplasmic reticulum stores the calcium ions that is released within the muscle cell during contraction

Actin is the protein on the thin filament that binds to the thick filament

Question 3

Which of the following directly covers a skeletal muscle?

Answers:

Perimysium

Epimysium

Sarcolemma

Endomysium

Question 4

Which choice best describes the function of myoglobin?

Answers:

It is a specialized protein on the thin filament

Stores glycogen

Assists in attaching the thick filament to the thin filament

It provides a reserve supply of oxygen for the muscle cell

Question 5

Which choice best describes the function T-tubules have within muscle contraction?

Answers:

Transmit the action potential deep into the muscle cell

Help align the thick and thin filament for contraction

Store glycogen

Store and release calcium ions into the cell interior for muscle contraction

Question 6

Which of the following is true of muscle contraction?

Answers:

ATP is converted to ADP during a power stroke.

The T-tubules release stored sodium and magnesium to initiate an action potential.

The Z-disks move farther apart during contraction.

The H-zone lengthens during contraction.

Question 7

Which statement is true regarding muscle contraction?

Answers:

The power stroke occurs when the thick filament binds to the thin filament

ATP is needed to release the thick filament from the thin filament

Tropomyosin protein binds to the actin protein

The T-tubules store the calcium ions within the internal part of the muscle cell

Question 8

Which statement is true regarding slow oxidative muscle fibers?

Answers:

It is fatigue resistant

Appears white in color within a specimen

They don’t contain myoglobin

They can contract only for short period of times

Question 9

Which of the following proteins blocks the active site on actin during relaxation?

Answers:

Myosin

Troponin

Actin

Tropomyosin

Question 10

Anaerobic respiration produces lactic acid as a by-product but creates more ATP for muscle contraction when compared to aerobic respiration.

Selected Answer:

False

Answers:

True

False

Question 11

Which statement is NOT true regarding muscle contraction?

Answers:

ATP is needed for the thick filament to bind to the thin filament

Tropomyosin protein covers the binding sites for the thick filament on the actin protein

The sarcoplasmic reticulum stores the calcium ions that are released within the muscle cell

Acetylcholine is the neurotransmitter that binds to the sarcolemma

Question 12

Which of the following is true of skeletal muscle tissue?

Answers:

Each cell has a single nucleus.

A skeletal muscle fiber typically contains a sarcolemma, t-tubules, and myofibrils.

Skeletal muscle cells have the same shape as smooth muscle cells.

A muscle cell is composed of hundreds of muscle fibers.

Question 13

Which of the following passes through the sarcoplasm, causing the sarcoplasmic reticulum to open its “gates”?

Answers:

Calcium

Sodium

Action potential

ATP

Question 14

Which structure separates one fascicle from another in a muscle?

Answers:

Perimysium

Epimysium

Fascia

Endomysium

Question 15

Which of the following substances is the neurotransmitter released from motor neurons initiating muscle contraction?

Answers:

Acetylcholinesterase

Acetylcholine

Dopamine

Norepinephrine