Ch. 8 Test

Question 1

How are muscle fibers arranged in skeletal muscle tissue

Answer 1

Parallel

Question 2

Which molecular component of blood provides the reddish pigment in skeletal muscle

Answer 2

Myoglobin

Question 3

What are the two types of protein filaments that make up the myofibrils of muscle fibers

Answer 3

Thin filaments

Thick filaments

Question 4

Which protein or thick filaments composed of

Answer 4

Myosin

Question 5

Which protein or thin filaments composed of

Answer 5

Actin

Question 6

During muscle contractions what causes the thin filaments to slide toward the center of a sarcomere

Answer 6

Myosin heads of the thick filaments pull on the thin filaments

Question 7

As thin filaments slide what part of the muscle fibers become narrower and eventually disappear

Answer 7

I bands and H zones

Question 8

What causes the shortening of the sarcomere during muscle contraction

Answer 8

Increased overlap of thin and thick filaments

Question 9

What type of neuron delivers the electrical signal necessary for a skeletal muscle fiber to contract

Answer 9

Motor neuron

Question 10

What are the swelling is at the end of the axon terminal’s of motor neurons called

Answer 10

Synoptic end bulbs

Question 11

What is the concentration level of calcium ions in the Sarco plasmic reticulum in muscle fibers are relaxed

Answer 11

Low concentration

Question 12

What is the concentration level of calcium ions in the sarcoplasmic reticulum one muscle fibers contract

Answer 12

High concentration

Question 13

What are the four repeating events (in order) of the contraction cycle

Answer 13

1. Splitting ATP
2. Forming cross bridges
3. Power stroke
4. Binding ATP and detaching

Question 14

What type of skeletal muscle changes can various types of exercise induce

Answer 14

Changes in the muscle fibers

Question 15

What to major changes do endurance exercise results in

Answer 15

Cardiovascular

Respiratory

Question 16

What do the changes listed in question above call skeletal muscle to do? What do they not do?

Answer 16

Receive better supply of oxygen and nutrients

Increase muscle mass

Question 17

List the three differences between cardiac muscle fibers and skeletal muscle fibers

Answer 17

Source of stimulation
Involuntary
Larger in diameter

Question 18

What term is given to the intrinsic rhythm of heart contractions

Answer 18

autorhythmicity

Question 19

How many times per minute does cardiac muscle tissue relax and contract under normal resting conditions

Answer 19

75

Question 20

What are the two kinds of smooth muscle tissue

Answer 20

Visceral

Multiunit

Question 21

Which type of hollow viscera are good examples of organs made up of visceral muscle tissue

Answer 21

Stomach
Uterus
Intestines
Urinary bladder

Question 22

List the three things that stimulate smooth muscle fibers in visceral muscle tissues

Answer 22

Neurotransmitter
Hormones
Auto rhythmic signal

Question 23

What characteristic of multi units me with muscle tissue permits hollow organs such as the uterus and urinary bladder to expand and contract

Answer 23

Stretchiness

Question 24

At what age do humans undergo a slow, progressive loss of skeletal muscle mass

Answer 24

30

Question 25

What three effects accompanied the loss of muscle mass in aging adult humans

Answer 25

Decrease in maximum strength
Slowing of muscle reflexes
Loss of flexibility

Question 26

What are two effective ways that older people can slow are reversed age associated decline in muscular performance

Answer 26

Aerobic activities in strength training programs