Unit 4: Notes 1

Question 1

name the functions of muscle

Answer 1

1. produce body movement
2. stabilize body position
3. regulate body volume
4. move substances internally (involuntary)
5. produce heat
6. help maintain homeostasis

Question 2

what are the physiological properties?

Answer 2

1. elasticity
2. contractibility
3. excitability
4. extensibility

Question 3

elasticity

Answer 3

ability to stretch and go back to normal shape

Question 4

contractability

Answer 4

ability to shorten

Question 5

excitability

Answer 5

ability to respond to stimuli

Question 6

extensibility

Answer 6

ability to stretch without tearing

Question 7

what are the common characteristics

Answer 7

1. all muscle fibers are elongated

2. have two types of muscle filaments for contraction (actin and myosin)

Question 8

name the three types of muscle

Answer 8

skeletal, smooth, cardiac

Question 9

what is the general info of skeletal muscle

Answer 9

1. 40%-50% of total body weight
2. controlled: consciously (voluntary)
3. aka voluntary muscle

Question 10

where is skeletal muscle found

Answer 10

attached to the bones

Question 11

. what does skeletal muscle look like

Answer 11

• thick
• long
• cylindrical
• unbranched
• striated
• multi-nucleated

Question 12

what are the functions of skeletal muscle

Answer 12

1. moving the skeleton
2. maintaining posture
3. stabilizing joints
4. generates heat

Question 13

is smooth muscle voluntary or involuntary

Answer 13

involuntary

Question 14

where is smooth muscle found

Answer 14

found in the walls of hollow organs in the walls of blood vessels

Question 15

what does the fibers of smooth muscle look like

Answer 15

• relatively small
• non-striated
• spindle shaped
• one nucleus/cell

Question 16

function of smooth muscle

Answer 16

internal movement

Question 17

is cardiac muscle voluntary or involuntary

Answer 17

involuntary

Question 18

where is cardiac muscle found

Answer 18

in the walls of the heart

Question 19

what do the fibers of cardiac muscle look like

Answer 19

• short
• branching
• cylindrical
• finely striated
• contain one nucleus per cell
• intercalated discs

Question 20

what are intecalated discs

Answer 20

joints between cells

Question 21

what is the function of cardiac muscle

Answer 21

pump blood