Chapter 10: muscle tissue

Question 1

sacroplasmic reticulum

Answer 1

stores and releases calcium ions

Question 2

depolarization

Question 3

repolarization

Question 4

neuromuscular junction

Question 5

excitation contraction coupling

Answer 5

The sequence of processes that links the action potential to contraction

Question 6

muscle relaxation

Question 7

Put the following structures in order from superficial to deep.

muscle fiber
perimysium
myofibril
fascicle
endomysium
epimysium

Answer 7

6, 2, 4, 5, 1, 3

Question 8

Muscle tissue, one of the four basic tissue groups, consists chiefly of cells that are highly specialized for

Answer 8

contraction.

Question 9

Which of the following is not characteristic of smooth muscle?

Answer 9

The striations are due to the orderly arrangement of actin and myosin.

Question 10

Receptors for acetylcholine are located on the

Answer 10

motor end plate.

Question 11

A fascicle is a

Answer 11

group of muscle fibers that are encased in the perimysium.

Question 12

The action potential is conducted into a skeletal muscle fiber by

Answer 12

transverse tubules.

Question 13

Each skeletal muscle fiber is controlled by a motor neuron at a single

Answer 13

neuromuscular junction.

Question 14

A muscle working at moderate intensity generates most of its ATP from which substrate(s)?

Answer 14

both glucose and fatty acids

Question 15

Triggering of the muscle action potential occurs after

Answer 15

acetylcholine binds to chemically-gated channels in the motor end plate

Question 16

Interactions between actin and myosin filaments of the sarcomere are responsible for

Answer 16

muscle contraction.

Question 17

Creatine phosphate

Answer 17

acts as an energy reserve in muscle tissue.

Question 18

In an isotonic contraction

Answer 18

muscle tension exceeds the load and the muscle lifts the load

Question 19

A resting muscle generates most of its ATP by

Answer 19

aerobic metabolism of fatty acids.

Question 20

The most important factor in decreasing the intracellular concentration of calcium ion after contraction is

Answer 20

active transport of calcium into the sarcoplasmic reticulum.

Question 21

thick filaments composed of ….

Answer 21

bundles of myosin

Question 22

thin filaments composed of..

Answer 22

composed of actin, tropomyosin, troponin

Question 23

membrane potentials

Answer 23

thin layer of (-) charged ions in cytosol and thin layer of (+) in ECF resting membrane potential is -90mv

Question 24

ligand gated channels

Question 25

voltage gated channels

Question 26

cross bridge cycle