muscles

Question 1

smooth muscles

Answer 1

only one nucleus
line the internal organs

Question 2

involuntary smooth muscles

Answer 2

slower to contract than skeletal
sustain prolonged contractions
does not fatigue easily

Question 3

cardiac (heart muscle)

Answer 3

forms wall of heart
tubular and striated
cells have one nucleus
involuntary

Question 4

skeletal (striated) muscle

Answer 4

attached to bones and pulls on the bones of the skeleton allowing body to move
over 600 skeletal muscles

Question 5

what does skeleton muscles do

Answer 5

stabilizes joints
supports body
protects internal organs
helps maintain a constant body temperature

Question 6

what are the 2 types of myofilents

Answer 6

myosin and actin

Question 7

myosin

Answer 7

dark thick filaments

Question 8

actin

Answer 8

light, thin filaments

Question 9

interaction of skeletal muscles

Answer 9

muscles that work in pairs and oppose each other
flexors (bending)
extensions ( unbending)
ex. biceps

Question 10

sliding filaments theory

Answer 10

actin filaments slide over myosin filaments
z lines move closer tg= contraction

Question 11

what provides energy for filaments sliding

Answer 11

ATP

Question 12

muscle fatigue

Answer 12

creating phosphate in muscle to ensure ATP supplies remain high

Question 13

ADP is supplied by phosphates to

Answer 13

replenish ATP supply

Question 14

what happens if energy demand exceeds ATP supply

Answer 14

lactic acid accumulates = waste, acidic fluid, = fail to contract

Question 15

summation

Answer 15

increased muscle contraction produced by the combo of stimuli

Question 16

tetanus

Answer 16

state of constant muscle contraction

Question 17

antagonist muscle

Answer 17

muscle that is relaxing or lengthening

Question 18

What components shorten during contraction

Answer 18

The sarcomere but not thick and thin filaments