Muscular System

Question 1

what are the 3 types of muscle tissue?

Answer 1

skeletal, cardiac, smooth

Question 2

what 3 properties do all muscles have?

Answer 2

1. excitability: electric gradient which can reverse when stimulated
2. contraction: ability to contract/ shorten
3. elongate: ability to elongate/ relax

Question 3

is skeletal muscle voluntary/ involuntary?
- what kind of cells is skeletal muscle made up of?
- how are these cells set up?
- is skeletal muscle striated/ nonstriated?

Answer 3

voluntary
- muscle fibers
- bound in bundles
- striated

Question 4

is smooth muscle voluntary/ involuntary?
- where can it be found?
- what is it AKA?
- is it striated/ nonstriated?

Answer 4

involuntary
- walls of internal organs, blood vessels, sphincters
- visceral tissue
- nonstriated

Question 5

is cardiac muscle voluntary/ involuntary?
- striated/ nonstriated?

Answer 5

involuntary
- striated

Question 6

skeletal muscle consists of numerous muscle fibers that each contain a bundle of ____ which are composed of repeating units called ____

Answer 6

myofibrils; sarcomeres

Question 7

myofibrils contain 2 ____, a ____ filament and a ____ filament.

Answer 7

microfilaments; thick; thin

Question 8

myosin

Answer 8

the protein that makes up the thick filament of myofibrils

Question 9

actin

Answer 9

the protein that makes up the thin filament of myofibrils

Question 10

how are striations in skeletal muscle formed?

Answer 10

when thick and thin filaments overlap

Question 11

what happens when an action potential reaches a muscle fiber?

Answer 11

calcium ions are released > bind to myosin and actin > myosin and actin bind to each other > adenosine triphosphate is released from glucose and provides the energy necessary for contraction