Muscles 1

1.

1 point

A voltage gated ion channel:

closes in response to defibrillation

closes because of acetylcholine

opens in response to adjacent membrane depolarization

Opens because of acetylcholine

2.

1 point

What does the sodium-potassium-ATP-ase pump do?

Uses ATP to pump sodium out of the cell and potassium into the cell at a rate of 3 sodium for every 2 potassium.

Uses ATP to pump sodium out of the cell and potassium into the cell at a rate of 2 sodium for every 3 potassium.

Uses ATP to pump sodium into the cell and potassium out of the cell at a rate of 3 sodium for every 2 potassium.

Uses ATP to pump sodium into the cell and potassium out of the cell at a rate of 2 sodium for every 3 potassium.

3.

1 point

Fascicles are made up of:

bundles of myogloins

singular sacromeres

bundles of muscle fibers

bundles of endomysium

4.

1 point

What are the two protein chains that actively cause muscle contraction?

actin and myosin

troponin and myosin

actin and myoglobin

globulin and myoglobin

5.

1 point

The functions of muscle include all of the following, except:

posture.

Movement, including peristalsis (movement of food through digestive tract).

Protection from invading pathogens.

help maintain homeostasis via a variety of functions.

6.

1 point

When considering resting membrane potential, what ion is found in higher concentration extracellularly?

Calcium

Potassium

Magnesium

Sodium

7.

1 point

Which muscle tissue (check all that apply) are considered involuntary?

Cardiac Muscle

Skeletal Muscle

Fast Muscle

Smooth Muscle

8.

1 point

When considering the muscle depolarization/repolarization process, which membrane protein exhibits active transport?

acetylcholinesterase

Potassium Channels

Sodium Channels

The sodium-potassium-ATP-ase pump

9.

1 point

What neurotransmitter is released at the neuromuscular junction (aka synapse) in order to stimulate muscle contraction?

acetylcholine

sodium

potassium

epinephrine

10.

1 point

Arnold Schwarzenegger probably has more of what type of muscle fibers?

fast muscle fibers

intermediate muscle fibers

slow muscle fibers

Illbebackofibrils

11.

1 point

What fibrous membrane covers fascicles?

paramysium

epimysium

endomysium

fascilomysium

12.

1 point

When repolarization occurs, what ion is the first to leave the cell?

Calcium

Potassium

Sodium

Phosphate

13.

1 point

When you workout at the gym, your muscles switch to anerobic metabolism. This produces ___________, which gets turned into ___________, because it is less toxic.

pyruvic acid, lactic acid

pyruvate, urea

lactic acid, pyruvic acid

pyruvate, pyruvic acid

14.

1 point

What is the smallest unit of contraction in a muscle?

z band

sarcomere

myofibril

endomysium

15.

1 point

When running in a marathon, you are more likely utilizing which type of muscle fibers?

slow muscle fibers

myoglobins

fast muscle fibers

myofibriliomas