chapter 36-2

Question 1

How much of the body is muscle mass?

Answer 1

40%

Question 2

What are the 3 different types of muscle tissue?

Answer 2

Skeletal, smooth, cardiac

Question 3

What are some features of skeletal muscles?

Answer 3

usually attached to bone
responsibly for voluntary movements
have many nuclei
sometimes called striated muscles

Question 4

What are some features of smooth muscles?

Answer 4

non-voluntary control
spindle-shaped
1 nucleus
not striated
found in many internal organs and blood vessels

Question 5

what are some features of cardiac muscle?

Answer 5

only found in the heart
is striated
one or two nuclei

Question 6

what are the fibers in skeletal muscle composed of?

Answer 6

small structures called myofibrils

Question 7

what is the smaller structure contained in each myofibrils?

Answer 7

filaments

Question 8

what is myosin?

Answer 8

myosin is a protein in thick filaments

Question 9

what is actin?

Answer 9

actin is the protein contained in thin filaments

Question 10

how does muscle contraction work?

Answer 10

the actin filaments slide over the moysin filaments decreasing the distance between the Z lines

Question 11

what supplies the energy for muscle contraction?

Answer 11

ATP

Question 12

what is a neuromuscular junction

Answer 12

is the point of contact between a motor neuron and a skeletal muscle cell

Question 13

when does a muscle cell contract?

Answer 13

until the release of acetylcholine stops and an enzyme produced at axon terminal destroys any remaining acetylcholine

Question 14

what are skeletal muscles joined by?

Answer 14

tendons