bio

Question 1

I band

Answer 1

all thin no thick filament

Question 2

a band

Answer 2

all thick myosin

Question 3

h zone

Answer 3

only thick myosin, no overlap of actin

Question 4

muscle fiber

Answer 4

serves as actual muscle cell

Question 5

sarcoplasm

Answer 5

acts as a cytoplasm, and fills the cell around organelles

Question 6

sarcoplasmic reticulum

Answer 6

synthesize lipids

Question 7

sarcolemma

Answer 7

muscle fiber plasma membrane

Question 8

terminal cisternae

Answer 8

storehouses for Ca ions

Question 9

when a muscle contracts the h zone it…

Answer 9

narrows and decreases

Question 10

when a muscle contracts actin and myosin it…

Answer 10

stays the same length

Question 11

steps in how an impulse reaches a muscle:

Answer 11

1. release of ACh (Ca ions release, vesicles move to edge of axon and undergo exocytosis)
2. ACh binds with specific receptors
3. Stimulates muscle to contract
4. enzymes cause ACh to break of receptors and stop contraction

Question 12

3 Muscle Types

Answer 12

Skeletal (voluntary)
Smooth (involuntary)
cardiac (involuntary)

Question 13

4 muscle functions

Answer 13

-movement
-generate heat
-moves substances through body
-stabilize us

Question 14

Properties of a muscle

Answer 14

1. contractibility-abilty to shorten
2. Electrical excitability- ability of muscle to receive signal from brain
3. elasticity-springs back to original position
4. extensibility- can stretch without tearing

Question 15

sarcomere

Answer 15

segment in a muscle that is responsible for contraction

Question 16

sliding filament

Answer 16

-actin-myosin interactions
-named for how sarcomeres shorten
- thick and thin filaments don’t change length, they slide past one another
-Thin filaments move towards the center of sarcomere on both ends.