Deck 8: Muscular System

Question 1

The outermost connective tissue layer of a muscle is the

A) ectomysium.
B) endomysium.
C) epimysium.
D) perimysium.

Answer 1

epimysium.

Question 2

If the fibers of a muscle are running caudoventrally, in which direction are they running?

A) to the back of the animal and down
B) to the back of the animal and up
C) to the front of the animal and down
D) to the front of the animal and up

Answer 2

to the back of the animal and down

Question 3

The internal abdominal oblique muscle is partially named based on

A) its action.
B) the direction its fibers run.
C) the number of its heads.
D) the shape of its fibers.

Answer 3

the direction its fibers run.

Question 4

When skeletal muscle contracts, which site undergoes the greatest movement?

A) belly of the muscle
B) head of the muscle
C) insertion of the muscle
D) origin of the muscle

Question 5

The linea alba is a/an

A) aponeurosis.
B) epimysium.
C) ligament.
D) tendon.

Question 6

The contracting unit of a skeletal muscle is the

A) actin.
B) myofibril.
C) myosin.
D) sarcomere.

Question 7

The average muscle fiber contraction cycle lasts about

A) 0.1 second.
B) 0.5 second.
C) 0.01 second.
D) 0.05 second.

Question 8

The "pacemaker" of the heart is the sinoatrial node located in the wall of the

A) left atrium.
B) left ventricle.
C) right atrium.
D) right ventricle.

Question 9

Which structure of a muscle contains adipose tissue that contributes to the grossly visible marbling of meat?

A) myofibril
B) perimysium
C) sarcoplasmic reticulum
D) transverse tubule

Question 10

The muscle in an animal that corresponds to the calf muscle in humans is the

A) biceps femoris muscle.
B) deep digital flexor muscle.
C) gastrocnemius muscle.
D) quadriceps femoris muscle.

Question 11

The all-or-nothing principle of muscle physiology refers to

A) release of acetyl cholinesterase.
B) release of calcium ions.
C) the contraction of a muscle.
D) the contraction of a muscle fiber.

Question 12

The diaphragm is composed of

A) involuntary nonstriated muscle.
B) involuntary striated muscle.
C) voluntary nonstriated muscle.
D) voluntary striated muscle.

Question 13

Which three muscles make up the hamstring muscle?

A) biceps femoris, semitendinosus, semimembranosus
B) gluteal, quadriceps femoris, biceps femoris
C) quadriceps femoris, gluteal, biceps femoris
D) semitendinosus, semimembranosus, gluteal

Question 14

The respiratory muscles that work together to increase the size of the thoracic cavity when they contract are the

A) abdominal and internal intercostal muscles.
B) abdominal and external intercostal muscles.
C) diaphragm and external intercostal muscles.
D) internal and external intercostal muscles.

Question 15

When the sternocephalicus muscle contracts what happens in the animal's body?

A) The rear leg is pulled backward.
B) The front leg is pulled forward.
C) The head and neck are lowered.
D) The head and neck are raised.

Question 16

Another name for a skeletal muscle cell is a skeletal muscle

A) fiber.
B) myofibril.
C) sarcoplasmic reticulum.
D) tubule.

Question 17

A skeletal muscle that contracts at the same time as the prime mover muscle and assists in carrying out the prime mover's action is a/an

A) agonist.
B) antagonist.
C) fixator.
D) synergist.

Question 18

What type of muscle controls the movement of an animal's skeleton?

A) involuntary nonstriated muscle
B) involuntary striated muscle
C) voluntary nonstriated muscle
D) voluntary striated muscle

Question 19

The triceps brachii muscle is partially named based on

A) its action.
B) its location.
C) its size of its fibers.
D) the direction its fibers run.

Question 20

Which motor unit would an animal most likely use to move its eyeball?

A) 1 nerve fiber, 2 muscle fibers
B) 10 nerve fibers, 1 muscle fiber
C) 2 nerve fibers, 20 muscle fibers
D) 20 nerve fibers, 10 muscle fibers

Question 21

Anaerobic muscle metabolism results in __ formation as a result of incomplete glucose metabolism.

A) acetylcholine
B) glycogen
C) lactic acid
D) myoglobin

Question 22

The parasympathetic nervous system has this overall effect on the heart.

A) It causes it to beat faster with less force.
B) It causes it to beat faster with more force.
C) It causes it to beat slower with less force.
D) It causes it to beat slower with more force.

Question 23

Stretching the wall of the small intestines will result in

A) decreased force of multiunit smooth muscle contraction.
B) decreased force of visceral smooth muscle contraction.
C) increased force of multiunit smooth muscle contraction.
D) increased force of visceral smooth muscle contraction.

Question 24

The two major sources of energy for normal muscle metabolism are

A) calcium and myoglobin.
B) glucose and calcium.
C) glucose and oxygen.
D) oxygen and myoglobin.

Question 25

Cardiac muscle is classified as

A) involuntary nonstriated muscle.
B) involuntary striated muscle.
C) voluntary nonstriated muscle.
D) voluntary striated muscle.

Question 26

Groups of cardiac muscle cells adapt their contraction rate to

A) the average contraction rate of all the cells.
B) the contraction rate of the fastest cell.
C) the contraction rate of the slowest cell.
D) the median contraction rate of all the cells.

Question 27

In muscle the source of a phosphate molecule needed to recharge an ADP molecule to an ATP molecule is

A) acetyl cholinesterase.
B) acetylcholine.
C) creatine phosphatase.
D) creatine phosphate.

Question 28

Which structures contain visceral smooth muscle?

A) lungs and stomach
B) small blood vessel walls and lungs
C) stomach and urinary bladder
D) urinary bladder and small blood vessel walls

Question 29

Smooth muscle is classified as

A) involuntary nonstriated muscle.
B) involuntary striated muscle.
C) voluntary nonstriated muscle.
D) voluntary striated muscle.