Question 1

In the absence of calcium, myosin cannot contact actin because of the presence of the ________ covering the myosin binding sites on actin.

Accepted Answer

troponin-t

Question 2

According to the ________ principle, a muscle cell contracts completely when adequately stimulated by a motor neuron.

Accepted Answer

The answer of According to the ________ principle, a muscle...

Question 3

Match the following.
-aerobically break down fatty acids and glucose

Accepted Answer

A) relaxation 
B) fast-twitch fibers 
C) twitch 
D) fatigue 
E) intercalated discs
F)latent period
G)slow-twitch fibers
H)recruitment
I)contraction 
A) relaxation 
B) fast-twitch fibers 
C) twitch 
D) fatigue 
E) intercalated discs
F)latent period
G)slow-twitch fibers
H)recruitment
I)contraction

Question 4

All of the following occur during the latent period of muscle contraction EXCEPT which one?

Accepted Answer

A)  Myofibrils shorten. 
B)  Calcium is released from the sarcoplasmic reticulum. 
C)  Muscle cell membrane initiates an electrical impulse, which travels into the muscle cell. 
D)  Myosin heads bind to actin filaments. 
E)  Troponin-tropomyosin complex shifts, exposing myosin heads. 
A)  Myofibrils shorten. 
B)  Calcium is released from the sarcoplasmic reticulum. 
C)  Muscle cell membrane initiates an electrical impulse, which travels into the muscle cell. 
D)  Myosin heads bind to actin filaments. 
E)  Troponin-tropomyosin complex shifts, exposing myosin heads.

Question 5

Using the figure above and labels A through D below, identify the structures indicated.
-Structure D is a(n) ________.

Accepted Answer

A) tendon 
B) fascicle 
C) whole muscle 
D) muscle fiber 
A) tendon 
B) fascicle 
C) whole muscle 
D) muscle fiber

Question 6

Which one of the following is characteristic of cardiac and smooth muscle, but not skeletal muscle?

Accepted Answer

A)  voluntary contraction 
B)  striated appearance 
C)  presence of gap junctions 
D)  presence of actin and myosin in muscle cells 
E)  contraction is initiated by motor neurons 
A)  voluntary contraction 
B)  striated appearance 
C)  presence of gap junctions 
D)  presence of actin and myosin in muscle cells 
E)  contraction is initiated by motor neurons

Question 7

A student, who was late for class, bounded up four flights of steps, ran down the hall, and then arrived in his classroom, huffing and puffing. This student was breathing hard in order to reverse his body's ________.

Accepted Answer

The answer of A student, who was late for class,...

Question 8

Activities associated with aerobic training result in an increase in the amount of ________ in the body.

Accepted Answer

The answer of Activities associated with aerobic training result in...

Question 9

What is the role of calcium ions during contraction of a skeletal muscle?

Accepted Answer

At rest, calcium ions are stored in the

Question 10

Which sequence lists the structures from largest, most inclusive, to smallest?

Accepted Answer

A)  muscle-thick filament-fascicle-muscle fiber-myofibril 
B)  muscle-fascicle-muscle fiber-myofibril-thick filament 
C)  fascicle-muscle-myofibril-muscle fiber-thick filament 
D)  muscle fiber-myofibril-muscle-fascicle-thick filament 
E)  thick filament-fascicle-myofibril-muscle-muscle fiber 
A)  muscle-thick filament-fascicle-muscle fiber-myofibril 
B)  muscle-fascicle-muscle fiber-myofibril-thick filament 
C)  fascicle-muscle-myofibril-muscle fiber-thick filament 
D)  muscle fiber-myofibril-muscle-fascicle-thick filament 
E)  thick filament-fascicle-myofibril-muscle-muscle fiber

Question 11

As the rate of stimulation of motor units of a muscle increases, muscle force increases. This process is known as ________.

Accepted Answer

The answer of As the rate of stimulation of motor...

Question 12

The process of increasing tone by activating more motor units is called ________.

Accepted Answer

The answer of The process of increasing tone by activating...

Question 13

Match the following.
-anaerobically break down creatine phosphate

Accepted Answer

A) relaxation 
B) fast-twitch fibers 
C) twitch 
D) fatigue 
E) intercalated discs
F)latent period
G)slow-twitch fibers
H)recruitment
I)contraction 
A) relaxation 
B) fast-twitch fibers 
C) twitch 
D) fatigue 
E) intercalated discs
F)latent period
G)slow-twitch fibers
H)recruitment
I)contraction

Question 14

Which one of the following is an example of an isometric contraction?

Accepted Answer

A)  person lifting books from the floor 
B)  tightening of abdominal muscles while sitting 
C)  kicking a soccer ball 
D)  swinging a golf club 
E)  doing abdominal "crunches" (sit-ups) 
A)  person lifting books from the floor 
B)  tightening of abdominal muscles while sitting 
C)  kicking a soccer ball 
D)  swinging a golf club 
E)  doing abdominal "crunches" (sit-ups)

Question 15

A complete cycle of contraction and relaxation of muscle cells due to stimulation by a motor neuron is called a muscle ________.

Accepted Answer

The answer of A complete cycle of contraction and relaxation...

Question 16

The region where a skeletal muscle cell and a motor neuron come into close proximity to one another is the ________.

Accepted Answer

neuromuscu

Question 17

Match the following.
-contain gap junctions that permit rapid electrical stimulation of muscle cells

Accepted Answer

A) relaxation 
B) fast-twitch fibers 
C) twitch 
D) fatigue 
E) intercalated discs
F)latent period
G)slow-twitch fibers
H)recruitment
I)contraction 
A) relaxation 
B) fast-twitch fibers 
C) twitch 
D) fatigue 
E) intercalated discs
F)latent period
G)slow-twitch fibers
H)recruitment
I)contraction

Question 18

Using the figure above, identify the parts of the sarcomere.
-Label D represents a(n) ________.

Accepted Answer

A) actin filament 
B) myosin filament 
C) Z-line 
D) sarcomere 
A) actin filament 
B) myosin filament 
C) Z-line 
D) sarcomere

Question 19

Match the following muscles to their function.
-flexes foot toward knee

Accepted Answer

A) gastrocnemius 
B) deltoid 
C) external oblique 
D) triceps brachii 
E) quadriceps
F)tibialis anterior
G)biceps brachii
H)trapezius 
A) gastrocnemius 
B) deltoid 
C) external oblique 
D) triceps brachii 
E) quadriceps
F)tibialis anterior
G)biceps brachii
H)trapezius

Question 20

Following intense exercise, the human body attempts to overcome oxygen debt by

Accepted Answer

A)  sweating. 
B)  elevating heart rate. 
C)  producing ATP. 
D)  taking deep breaths. 
E)  inhibiting contractions of smooth muscle. 
A)  sweating. 
B)  elevating heart rate. 
C)  producing ATP. 
D)  taking deep breaths. 
E)  inhibiting contractions of smooth muscle.

Exam 6: The Muscular System

In the absence of calcium, myosin cannot contact actin because of the presence of the ________ covering the myosin binding sites on actin.

According to the ________ principle, a muscle cell contracts completely when adequately stimulated by a motor neuron.

Match the following. -aerobically break down fatty acids and glucose

All of the following occur during the latent period of muscle contraction EXCEPT which one?

Using the figure above and labels A through D below, identify the structures indicated. -Structure D is a(n) ________.

Which one of the following is characteristic of cardiac and smooth muscle, but not skeletal muscle?

A student, who was late for class, bounded up four flights of steps, ran down the hall, and then arrived in his classroom, huffing and puffing. This student was breathing hard in order to reverse his body's ________.

Activities associated with aerobic training result in an increase in the amount of ________ in the body.

What is the role of calcium ions during contraction of a skeletal muscle?

Which sequence lists the structures from largest, most inclusive, to smallest?

As the rate of stimulation of motor units of a muscle increases, muscle force increases. This process is known as ________.

The process of increasing tone by activating more motor units is called ________.

Match the following. -anaerobically break down creatine phosphate

Which one of the following is an example of an isometric contraction?

A complete cycle of contraction and relaxation of muscle cells due to stimulation by a motor neuron is called a muscle ________.

The region where a skeletal muscle cell and a motor neuron come into close proximity to one another is the ________.

Match the following. -contain gap junctions that permit rapid electrical stimulation of muscle cells

Using the figure above, identify the parts of the sarcomere. -Label D represents a(n) ________.

Match the following muscles to their function. -flexes foot toward knee

Following intense exercise, the human body attempts to overcome oxygen debt by

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