Human Phys. Muscles Test

Question 1

Muscle def.

Answer 1

collection of muscle cells

Question 2

fascicle def.

Answer 2

bundles of muscle cells together with their associated connective tissue, blood vessels, and nerve cells within a muscle

Question 3

muscle fiber (myofiber) def.

Answer 3

single muscle cell, fusion of multiple myoblasts during development.
These are excitable cells

Question 4

sarcolemma def

Answer 4

muscle fiber’s plasma membrane

Question 5

sarcoplasm def

Answer 5

semifluid cytoplasm of a muscle cell

Question 6

myofibril def

Answer 6

rod-like bundle that contains the contractile machinery (actin and myosin).
Runs along the length of muscle fiber

Question 7

Sarcoplasmic reticulum def

Answer 7

saclike membranous network that surrounds myofibrils and releases calcium ions to trigger muscle contractions

Question 8

sarcomere def

Answer 8

fundamental functional unit of contraction found in myofribils that repeats over and over.
Bordered on each side by z-lines which anchor actin during contraction

Question 9

thin filaments def

Answer 9

actin + troponin + topomyosin
actin is formed from a double chain of globular proteins tha tis wound with tropomyosin to form a strand
Toponin holds tropomyosin to actin

Question 10

z line def

Answer 10

proteins that run perpendicular to the muscle axis for actin attachment

Question 11

types of muscle that has striations

Answer 11

skeletal and cardiac

Question 12

type of muscle that has actin and myosin

Answer 12

skeletal, smooth, cardiac

Question 13

type of muscle that has no striations

Answer 13

smooth

Question 14

type of muscle that is under voluntary control

Answer 14

skeletal

Question 15

type of muscle that is under involuntary control

Answer 15

smooth and cardiac