Study Guide ch.11

Question 1

Which of the following is not general function of muscle tissue

a) movement
b) protection
c) heat production
d) posture

Answer 1

protection

Question 2

The skeletal muscle fiber characteristic of excitability directly results in these cells being capable of:

a) responding to nerve signals
b) shortening
c) returning to resting length after contracting
d) producing heat

Answer 2

responding to nerve signals

Question 3

The correct order of arrangement of skeletal muscle cells, from largest to smallest is:

a) fiber, myofibril, myofilament
b) myofibril, myofilament, fiber
c) myofilament, myofibril, fiber
d) fiber, myofilament, myofibril

Answer 3

fiber, myofibril, myofilament

Question 4

Sarcoplasmic reticulum is:

a) a system of transverse tubules that extend at a right angle to the long axis of the cell
b) a segment of the myofibril between two successie Z lines
c) a unique name for the plasma membrane of a muscle fiber
d) none of the above

Answer 4

none of the above

Question 5

Which of the following are myofilament proteins?

a) troponin
b) tropomyosin
c) a and b
d) none of the above

Answer 5

a and b

Question 6

The contractile unit of a myofibril is the:

a) sarcomere
b) triad
c) sacrolemma
d) cross-bridge

Answer 6

sacromere

Question 7

The chief function of the T tubule is to:

a) provide nutrients to the muscle fiber
b) allow the fiber to contract
c) allow the electrical signal to move deep into the cell
d) allow the generation of new muscle fibers

Answer 7

allow the electrical signal to move deep into the cell

Question 8

Myosin heads are also called:

a) cross-bridges
b) motor endplates
c) synapses
d) motor neurons

Answer 8

synapses

Question 9

During muscle contraction, Ca++ is released from the:

a) synaptic cleft
b) mitochondria
c) sarcoplasmic reticulum
d) sacroplasm

Answer 9

sacroplasmic reticulum

Question 10

The region of a muscle fiber where a motor meuron connects to the muscle fiber is called the:

a) synaptic vesicle
b) motor endplate
c) H band
d) none of the above

Answer 10

motor endplate

Question 11

True or False

The thick myofilament is made up of myosin

Answer 11

True

Question 12

True or False

Skeletal muscle has a poor ability to stretch

Answer 12

False

Question 13

True or False

A T tubule sandwhiched betweeb sacs of sacroplasmic reticulum is called a condon

Answer 13

False

Question 14

True or False

Acrin, troponin and tropomyosin are present on the thin myofilament

Answer 14

True

Question 15

True or False

The I band resides within a single sacromere

Answer 15

True

Question 16

True or False

Rigor mortis is caused by a lack of ATP to “turn off” muscle contraction

Answer 16

True

Question 17

The cell membrane of a muscle fiber is called the sacroplasmic reticulum

Answer 17

False

Question 18

Anaerobic respiration is the first choice of the muscle cell for the production of ATP

Answer 18

False

Question 19

During rest, excess oxygen, molecules in the sacroplasm are attracted to a large protein molecule called myoglobin

Answer 19

True

Question 20

Anaerobic respiration results in the formation of an incompletely catabolized molecule called lactic acid

Answer 20

True

Question 21

The principal component(s) of a motor unit is/are:

a) one somatic motor neuron
b) the muscle fibers supplied by a somatic motor neuron
c) none of the above
d) both a and b

Answer 21

both a and b

Question 22

The staircase phenomenon is also known as:

a) tetanus
b) electromyography
c) wave summation
d) treppe

Answer 22

treppe

Question 23

Skeletal muscles are innervated by:

a) somatic motor neurons
b) autonomic motor neurons
c) both a and b
d) internal stimulation

Answer 23

somatic motor neurons

Question 24

Which of the following statements concerning isometric contractions is true

a) the length of the muscle changes
b) muscle tension decreases
c) joint movements are swift
d) muscle length remains constant

Answer 24

muscle length remains constant

Question 25

Physiologic muscle fatigue is caused by: a) relative lack of ATP b) oxygen debt c) lack of will d) none of the above

Answer 25

relative lack of ATP

Question 26

Increase in muscle size is called: a) hyperplasia b) atrophy c) hypertrophy d) treppe

Answer 26

hypertrophy

Question 27

Endurance training is also called: a) isometrics b) hypertophy c) aerobic training d) anaerobic training

Answer 27

aerobic training

Question 28

True or False | A muscle contracts the instant it is stimulated

Answer 28

flase

Question 29

True or False Isotonic contraction is one in which the tone or tension within a muscle remains the same, but the length of he muscle changes

Answer 29

True

Question 30

True or False | One method of studying muscle contraction is called myography

Answer 30

True

Question 31

True or False | muscles with more tone than normal are described as flaccid

Answer 31

false

Question 32

When a muscle does not shorten and no movement results, the contraction is: a) isometric b) isotonic c) twitch d) tetanic

Answer 32

isometric

Question 33

Pushing against a wall is an example of which type of contraction? a) isotonic b) isometric c) twitch d) tetanic

Answer 33

isometric

Question 34

Prolonged inactivity causes muscles to shrink in mass, a condtition called: a) hypertrophy b) disuse atrophy c) paralysis d) muscle fatigue

Answer 34

disuse atrophy

Question 35

Muscle fibers usually contract to about_______% of their starting length a) 50 b) 60 c) 70 d) 80

Answer 35

80

Question 36

Which statement is true of smooth muscle? a) it lines the walls of many hollow organs b) it is striated c) it is voluntary d) there are many T tubules throughout smooth muscle

Answer 36

It lines the walls of many hollow organs

Question 37

What is a quick, jerky response of a given muscle to a single stimulus called a) isometric b) lockjaw c) tetanus d) twitch

Answer 37

twitch

Question 38

True or False | The energy required for muscular contraction is obtained by hydolysis of amino acids

Answer 38

False

Question 39

Ture or False | A motor neuron together with the cells it innervates is called a motor unit

Answer 39

True

Question 40

If muscle cekks are stimulated repeatedly without adequate periods of rest, the strength of the muscle contraction will decrease, resulting in fatigue

Answer 40

True

Question 41

The minimal level of stimulation required ro cause a fiber to contract is called the threshold stimulus

Answer 41

True

Question 42

Weakness of abdominal muscles can lead to a hernia

Answer 42

True

Question 43

There are two types of smooth muscle: viscreal and multiunit

Answer 43

True

Question 44

True or False | Cardiac muscle is also known as striated involuntary

Answer 44

True

Question 45

True or False The length/tension relationship states that the maximal strength a muscle can develop is related to the length of the fibers

Answer 45

True

Question 46

True or False | Skeletal muscles have little effect on body temperature

Answer 46

False