Because skeletal muscle contractions require large amounts of atp, you would expect skeletal muscle to have
group of answer choices

a rich blood supply

a rich nerve supply

very few mitochondria

little need for oxygen

all of the above.

flag this question
question 91 pts
since skeletal muscle movements are controlled by nerve impulses, in which of the following would you expect the ratio of motor neurons to muscle fibers to be the greatest?
group of answer choices

large muscles of the upper arm

postural muscles of the back

muscles that control eye movements

the calf muscles

flag this question
question 101 pts
which of the following activities would use isometric contractions?
group of answer choices

flexing the forearm

chewing food

running

maintaining upright posture

flag this question
question 111 pts
a person whose genetic makeup makes him/her a better marathon runner than a sprinter probably has in his/her leg muscles.
group of answer choices

fast fibers

intermediate fibers

slow fibers

non-contractile fibers

flag this question
question 121 pts
the area of the sarcomere containing the thick filaments is the
group of answer choices

z line

m line

a band

i band

flag this question
question 131 pts
when a calcium ion binds to troponin,
group of answer choices

tropomyosin moves out of the actin active sites

active sites on the myosin are exposed

actin heads will bind to myosin

muscle relaxation occurs

flag this question
question 141 pts
the degree of relative movement is greater in the
group of answer choices

pelvic girdle

pectoral girdle

flag this question
question 151 pts
based on what you've learned about how muscles are named, which muscle would you expect to contract when grasping an object in the hand?
group of answer choices

flexor digitorum

palmaris longus

pronator teres

supinator

*100% CORRECT ANSWERS

Question 1

Which of the following is not a function of skeletal muscle?

control blood vessel diameter

Question 2

Interactions between actin and myosin filaments are responsible for

muscle contraction

Question 3

At rest, active sites on actin are blocked by

tropomyosin molecules

Question 4

When energy reserves in a muscle are exhausted or lactic acid levels increase,

fatigue occurs and contraction is no longer possible

Question 5

The more movable end of a muscle is the

insertion

Question 6

Rigor mortis occurs in skeletal muscles a few hours after death. This is most likely due to

decreased ATP production and increased membrane permeability to calcium

Question 7

Each of the following changes in the skeletal muscle is a consequence of aging except  one. Identify the exception.

muscle fibers increase their energy reserves

Question 8

Because skeletal muscle contractions require large amounts of ATP, you would expect  skeletal muscle to have

a rich blood supply

Question 9

Since skeletal muscle movements are controlled by nerve impulses, in which of the  following would you expect the ratio of motor neurons to muscle fibers to be the  greatest?

muscles that control eye movements

Question 10

Which of the following activities would use isometric contractions?

maintaining upright posture

Question 11

A person whose genetic makeup makes him/her a better marathon runner than a sprinter  probably has ___ in his/her leg muscles.

slow fibers

Question 12

The area of the sarcomere containing the thick filaments is the

A band

Question 13

When a calcium ion binds to troponin,

tropomyosin moves out of the actin active sites

Question 14

The degree of relative movement is greater in the

pectoral girdle

Question 15

Based on what you've learned about how muscles are named, which muscle would you  expect to contract when grasping an object in the hand?

flexor digitorum

rtgh gf tfg sxzt hgstr hsd gh trh fhrd rd

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products