ch. 9 muscles

Question 1

Skeletal muscle

Answer 1

attach to and cover the skeleton

skeletal, striated, voluntary

Question 2

Cardiac muscle

Answer 2

occurs only in the heart,

cardiac, striated, involuntary

Question 3

smooth muscle

Answer 3

found in walls of hollow visceral organs,

visceral, non striated, and involuntary

Question 4

Excitability

Answer 4

ability to recive and respond to stimuli

Question 5

contractity

Answer 5

the ability to contact when stimulated

Question 6

extensibility

Answer 6

the ability to extend when stimulated

Question 7

elasticity

Answer 7

the ability of a muscle to recoil and resume its resting length after stretching

Question 8

Muscle functions

Answer 8

producing movement, maintaining posture and body position, stabilizing joints,generating heat,

Question 9

Nerve and blood supply skeletal muscle

Answer 9

every skeletol muscle fiber is supplied with a nerve ending that controls activity, has a rich blood supply,

Question 10

Conective tissue sheaths

Answer 10

wrap individual muscle fibers, support each cell, prevent muscle from bursting
3 types Epimysium, Endomysium, Perimysum and facicles

Question 11

Epimysium

Answer 11

(out side) overcoat of dense irregular connective tissue that surrounds the whole muscle.

Question 12

perimysium and fascicles

Answer 12

muscle fibers are grouped into fasicles(bundles) that resembel a bundle of sticks, surrounding each bundle is a fibrous connective tissue called perimysium

Question 13

endomysium

Answer 13

(within) sheath of connective tissue that surrounds each individual muscle fiber

Question 14

Sarcoplasm

Answer 14

cytoplasm of muscle cell, similar to other cytoplasms, but contains large amounts of glycosomes(stored glycogen) and myoglobin(red pigment that stores oxygen)

Question 15

Myofibrils

Answer 15

a single muscle fiber contains hundreds so thousands of rod like myofibrils that run parallel in length

Question 16

striation

Answer 16

repeatingseries of dark and light bands along the length of each myofibril

Question 17

Sarcomere

Answer 17

Smallest contractile unit (functional unit) of
muscle fiber
Align along myofibril like boxcars of train
Contains A band with ½ I band at each
end
Composed of thick and thin myofilaments
made of contractile proteins

Question 18

Myofibril Banding Pattern

Answer 18

Orderly arrangement of actin and myosin
myofilaments within sarcomere Actin myofilaments
= thin filaments
Extend across I band and partway in A band
Anchored to Z discs Myosin myofilaments = thick filaments Extend length of A band Connected at M line

Question 19

sacroplasmic reticulum

Answer 19

interconnecting tublules surround each myofibril surronds each myofibril

Question 20

somatic motor neurons

Answer 20

nerve cells that activate skeletal muscle fibers