BSC2346 2019 January Module 4 Quiz Latest

BSC2346 Human Anatomy and Physiology I

Module 04 Quiz

Question 1

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

Answers:            

 Transmit the action potential deep into the muscle cell

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

Help align the thick and thin filament for contraction

Store glycogen

Question 2

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

Answers:            

 Tropomyosin

Myosin

Actin

Troponin

Question 3

                Which factor is required to allow for muscle contraction?

Answers:            

Acetylcholine binds to the motor neuron

 Cross bridging of the thick and thin filament

Sodium ions to be present within the muscle fiber’s cytoplasm

Actin heads bind to troponin filament

Question 4

                Which statement is true regarding muscle contraction?

Answers:            

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

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

Tropomyosin protein binds to the actin protein

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

Question 5

Which statement is NOT true regarding muscle contraction?

Answers:            

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

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

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

Acetylcholine is the neurotransmitter that binds to the sarcolemma

Question 6

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

Answers:            

Sodium

ATP

 Action potential

Calcium

Question 7

Which of the following is true of muscle contraction?

Answers:            

The H-zone lengthens during contraction.

The Z-disks move farther apart during contraction.

 ATP is converted to ADP during a power stroke.

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

Question 8

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

Answers:            

Norepinephrine

Acetylcholinesterase

Dopamine

 Acetylcholine 

Question 9

What statement is true of smooth muscle?

Answers:            

It has a striated appearance when viewed under a microscope

It only contracts through conscious control

Its contraction is controlled by the same mechanism as skeletal muscle

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

Question 10

Fast oxidative muscle fibers do not fatigue quickly due to its rich supply of myoglobin.

Answers:            

True

 False

Question 11       

The motor end plate is the:

Answers:            

Open space where neurotransmitters move freely

Portion of a neuron that contains vesicles of acetylcholine

Depression on the sarcolemma where the synaptic knob fits

End of the motor neuron that looks like a bulb shape and releases acetylcholine

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

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

Answers:            

True

 False

Question 14

Which of the following directly covers a skeletal muscle?

Answers:            

Sarcolemma

 Epimysium

Perimysium

Endomysium

Question 15       

Which statement is true regarding slow oxidative muscle fibers?

Answers:            

They don’t contain myoglobin

Appears white in color within a specimen

It is fatigue resistant

They can contract only for short period of times