Exam 2

Question 1

The characteristic of muscle that allows it to be passively stretched is?`

Answer 1

Extensibility

Question 2

The proptery of muscle tissue that allows an impulse to travel down the entire length of the cell membrane is?

Answer 2

conductivity

Question 3

In general a skeletal muscle is composed of ?

Answer 3

Connective tissue -> nerves -> arteries -> veins -> muscle fibers

Question 4

What is the correct listing of the hieracrhy of a skeletal muscle’s component ( small to large) ?

Answer 4

Myofibrils -> Muscle fiber -> fascicle -> Fascicle -> skeletal muscle

Question 5

A flat thin structure made of dense connective tissue that serves to attach a muscle to a bone (or to another muscle) is a ?

Answer 5

aponeurosis

Question 6

Which letter is associated with a zone (in a relaxed muscle) that is a little more lightly shaded because only thick filaments are present

Answer 6

H

Question 7

Which of the following structures has the active sites to which the heads of the thick filaments will bind?

Answer 7

Actin

Question 8

Myoglobin is a molecule within muscle cells that can bind

Answer 8

Oxygen

Question 9

The presence of mitochondria and myoglobin facilitate_________ respiration in muscle cells.

Answer 9

Aerobic

Question 10

The repolarization of the action potential involves the opening of

Answer 10

voltage-gated K+ channels

Question 11

Which sequence correctly lists the changes that allow the thick and thin filaments to slide past one another in skeletal muscle contraction?

Answer 11

Pivot - attach - detach - return

Question 12

A drug that inhibited acetylcholinesterase would result in

Answer 12

enhanced stimulation of the muscle due to decreased ACh breakdown

Question 13

For relaxation to occur :

Answer 13

ACh receptors close and Ca++ channels on the sarcoplasmic reticulum close

Question 14

Glycolysis is an ?

Answer 14

anaerobic process that occurs in the cytosol

Question 15

Oxidative fibers are?

Answer 15

red and fatigue-resistent

Question 16

The increase in muscle tension that occurs with an increase in the intensity (voltage) of a stimulus is called?

Answer 16

recruitment

Question 17

Consider the difference between lifting a light pad of paper versus a heavy textbook. The primary way the level of force of muscle contraction is controlled by?

Answer 17

Recruiting a different number of motor units

Question 18

Muscle tone is a result of_________ nervous system activity, and it acts to_________ joint position

Answer 18

involuntary, stabilize

Question 19

When a muscle is isometrically contracted, its length_________ change.

Answer 19

does not

Question 20

Lifting weights will cause muscles to enlarge. This is primarily due to

Answer 20

An increase in the size of muscle cells

Question 21

Smooth muscle tissue in which cells are individually sent signals to contract (rather than contracting in unison) is referred to as

Answer 21

multiunit

Question 22

The most abundant form of smooth muscle is

Answer 22

Single-unit, which is also known as visceral smooth muscle

Question 23

Which type of smooth muscle is innervated most similar to skeletal muscle, with muscle cells arranged as motor units and each cell stimulated by a single motor neuron?

Answer 23

Multiunit smooth muscle

Question 24

When a muscle is isometrically contracted, its length_________ change.

Answer 24

Does not

Question 25

The presence of mitochondria and myoglobin facilitate_________ respiration in muscle cells.

Answer 25

aerobic