Question 1

-The letter A in this figure represents the

Accepted Answer

A)  action potential. 
B)  synaptic vesicles. 
C)  acetylcholine molecules. 
D)  synaptic cleft. 
E)  sodium ions. 
A)  action potential. 
B)  synaptic vesicles. 
C)  acetylcholine molecules. 
D)  synaptic cleft. 
E)  sodium ions. D

Question 2

The actin myofilaments are anchored into the cytoskeleton of the cell by the __________.

Accepted Answer

A)  Z disks 
B)  A band 
C)  M line 
D)  I band 
E)  H zone 
A)  Z disks 
B)  A band 
C)  M line 
D)  I band 
E)  H zone A

Question 3

ATP

Accepted Answer

A)  attaches to the myosin myofilaments. 
B)  provides energy for the movement of the cross bridges. 
C)  is required for muscle relaxation. 
D)  releases part of its energy as heat. 
E)  has all of these characteristics. 
A)  attaches to the myosin myofilaments. 
B)  provides energy for the movement of the cross bridges. 
C)  is required for muscle relaxation. 
D)  releases part of its energy as heat. 
E)  has all of these characteristics. E

Question 4

Which of the following muscles most likely contains motor units that are relatively small (motor neurons that innervate only a small number of muscle fibers each)?

Accepted Answer

A)  the biceps femoris. 
B)  the trapezius. 
C)  the intrinsic hand muscles. 
D)  the latissimus dorsi 
E)  the sternocleidomastoid. 
A)  the biceps femoris. 
B)  the trapezius. 
C)  the intrinsic hand muscles. 
D)  the latissimus dorsi 
E)  the sternocleidomastoid.

Question 5

A condition known as flaccid paralysis:

Accepted Answer

A)  arises because the muscle is incapable of contracting in response to nervous stimulation 
B)  arises because acetylcholinesterase levels are artificially low 
C)  arises because the muscle is incapable of relaxing 
D)  arises because acetylcholine in the neuromuscular junction never breaks down 
E)  all of these are true. 
A)  arises because the muscle is incapable of contracting in response to nervous stimulation 
B)  arises because acetylcholinesterase levels are artificially low 
C)  arises because the muscle is incapable of relaxing 
D)  arises because acetylcholine in the neuromuscular junction never breaks down 
E)  all of these are true.

Question 6

The _______ phase is the time between the application of a stimulus and the beginning of a contraction.

Accepted Answer

A)  lag 
B)  relaxation 
C)  contraction 
D)  refractory 
A)  lag 
B)  relaxation 
C)  contraction 
D)  refractory

Question 7

A _________ is a single muscle cell.

Accepted Answer

A)  myofilament 
B)  myofibril 
C)  muscle fiber 
D)  muscle fasciculus 
E)  whole skeletal muscle 
A)  myofilament 
B)  myofibril 
C)  muscle fiber 
D)  muscle fasciculus 
E)  whole skeletal muscle

Question 8

Smooth muscle

Accepted Answer

A)  has no distinct sarcomeres. 
B)  contracts more slowly than skeletal muscle. 
C)  may be autorhythmic. 
D)  does not develop an oxygen deficit. 
E)  has all of these characteristics. 
A)  has no distinct sarcomeres. 
B)  contracts more slowly than skeletal muscle. 
C)  may be autorhythmic. 
D)  does not develop an oxygen deficit. 
E)  has all of these characteristics.

Question 9

The ________ is the functional unit of skeletal muscle because it is the smallest portion of the skeletal muscle capable of ___________.

Accepted Answer

A)  muscle fiber, receiving a stimulus 
B)  muscle fiber, contracting 
C)  sarcomere, contracting 
D)  sarcomere, receiving a stimulus 
E)  myofibril, contracting 
A)  muscle fiber, receiving a stimulus 
B)  muscle fiber, contracting 
C)  sarcomere, contracting 
D)  sarcomere, receiving a stimulus 
E)  myofibril, contracting

Question 10

Muscle fibers

Accepted Answer

A)  have a relatively high metabolic rate 
B)  depend upon large amounts of O2 
C)  contain large numbers of mitochondria 
D)  preferentially use aerobic respiration 
E)  all of these are true of muscle fibers 
A)  have a relatively high metabolic rate 
B)  depend upon large amounts of O2 
C)  contain large numbers of mitochondria 
D)  preferentially use aerobic respiration 
E)  all of these are true of muscle fibers

Question 11

The _________ is the smooth ER of a muscle fiber and stores calcium ions.

Accepted Answer

A)  sarcolemma 
B)  sarcoplasmic reticulum 
C)  sarcomere 
D)  sarcoplasm 
E)  T tubules 
A)  sarcolemma 
B)  sarcoplasmic reticulum 
C)  sarcomere 
D)  sarcoplasm 
E)  T tubules

Question 12

In skeletal muscle contraction and relaxation, calcium ions

Accepted Answer

A)  bind to myosin myofilaments. 
B)  are returned to the sarcoplasmic reticulum by active transport. 
C)  are released from the T tubules by active transport. 
D)  provide the energy for muscle contraction. 
E)  have both bind to myosin myofilaments and are returned to the sarcoplasmic reticulum by active transport as normal properties. 
A)  bind to myosin myofilaments. 
B)  are returned to the sarcoplasmic reticulum by active transport. 
C)  are released from the T tubules by active transport. 
D)  provide the energy for muscle contraction. 
E)  have both bind to myosin myofilaments and are returned to the sarcoplasmic reticulum by active transport as normal properties.

Question 13

Connective tissue that surrounds the fasciculi is called

Accepted Answer

A)  perimysium. 
B)  endomysium. 
C)  fascia. 
D)  fasciculi. 
E)  microfibrils. 
A)  perimysium. 
B)  endomysium. 
C)  fascia. 
D)  fasciculi. 
E)  microfibrils.

Question 14

Slow-twitch muscle fibers

Accepted Answer

A)  are the predominant type of muscle fibers in the upper limbs. 
B)  have a richer blood supply than fast twitch fibers, and contain myoglobin. 
C)  would be used for activities resulting in (or requiring) anaerobic respiration. 
D)  fatigue more easily than fast-twitch fibers. 
E)  have all of these characteristics. 
A)  are the predominant type of muscle fibers in the upper limbs. 
B)  have a richer blood supply than fast twitch fibers, and contain myoglobin. 
C)  would be used for activities resulting in (or requiring) anaerobic respiration. 
D)  fatigue more easily than fast-twitch fibers. 
E)  have all of these characteristics.

Question 15

Extensibility is the ability of skeletal muscle to

Accepted Answer

A)  shorten with force. 
B)  respond to a stimulus. 
C)  recoil to their original resting length. 
D)  be stretched. 
E)  create heat energy through contraction. 
A)  shorten with force. 
B)  respond to a stimulus. 
C)  recoil to their original resting length. 
D)  be stretched. 
E)  create heat energy through contraction.

Question 16

Which of the following characteristics would establish conclusively that muscle tissue being examined was skeletal muscle tissue?

Accepted Answer

A)  several nuclei per cell 
B)  striations present 
C)  contracts spontaneously 
D)  intercalated disks present 
E)  under involuntary control 
A)  several nuclei per cell 
B)  striations present 
C)  contracts spontaneously 
D)  intercalated disks present 
E)  under involuntary control

Question 17

Given these events: 1) calcium ions move along their concentration gradient
2) action potential in cell membrane
3) opening of ion channels in sarcoplasmic reticulum
4) action potential in T tubules
5) actin to myosin cross-bridges form
Arrange them in the correct sequence as they participate during skeletal muscle contraction.

Accepted Answer

A)  1, 2, 5, 3, 4 
B)  1, 5, 4, 3, 2 
C)  2, 4, 3, 1, 5 
D)  2, 1, 5, 3, 4 
E)  5, 3, 4, 2, 1 
A)  1, 2, 5, 3, 4 
B)  1, 5, 4, 3, 2 
C)  2, 4, 3, 1, 5 
D)  2, 1, 5, 3, 4 
E)  5, 3, 4, 2, 1

Question 18

An anterior thigh muscle that extends the leg is the

Accepted Answer

A)  sartorius. 
B)  quadriceps femoris. 
C)  hamstring group. 
D)  adductor group. 
E)  iliopsoas. 
A)  sartorius. 
B)  quadriceps femoris. 
C)  hamstring group. 
D)  adductor group. 
E)  iliopsoas.

Question 19

What would happen if the cell membrane suddenly became impermeable to K+ ions?

Accepted Answer

A)  The outside of the cell membrane would become more positively charged. 
B)  The cell would become more negatively charged. 
C)  The cell would become more positively charged. 
D)  The cell would depolarize. 
E)  The outside of the cell membrane would become more positively charged and the cell would depolarize are correct. 
A)  The outside of the cell membrane would become more positively charged. 
B)  The cell would become more negatively charged. 
C)  The cell would become more positively charged. 
D)  The cell would depolarize. 
E)  The outside of the cell membrane would become more positively charged and the cell would depolarize are correct.

Question 20

-The letter B in this figure represents

Accepted Answer

A)  action potential. 
B)  synaptic vesicles. 
C)  acetylcholine molecules. 
D)  synaptic cleft. 
E)  sodium ions. 
A)  action potential. 
B)  synaptic vesicles. 
C)  acetylcholine molecules. 
D)  synaptic cleft. 
E)  sodium ions.

-The letter A in this figure represents the

The actin myofilaments are anchored into the cytoskeleton of the cell by the __________.

ATP

Which of the following muscles most likely contains motor units that are relatively small (motor neurons that innervate only a small number of muscle fibers each)?

A condition known as flaccid paralysis:

The _______ phase is the time between the application of a stimulus and the beginning of a contraction.

A _________ is a single muscle cell.

Smooth muscle

The is the functional unit of skeletal muscle because it is the smallest portion of the skeletal muscle capable of ___.

Muscle fibers

The _________ is the smooth ER of a muscle fiber and stores calcium ions.

In skeletal muscle contraction and relaxation, calcium ions

Connective tissue that surrounds the fasciculi is called

Slow-twitch muscle fibers

Extensibility is the ability of skeletal muscle to

Which of the following characteristics would establish conclusively that muscle tissue being examined was skeletal muscle tissue?

An anterior thigh muscle that extends the leg is the

What would happen if the cell membrane suddenly became impermeable to K⁺ ions?

-The letter B in this figure represents

The Human Organism

The Chemical Basis of Life

Cell Structures and Their Functions

Tissuesasis of Life

Integumentary System

Skeletal System: Bones and Joints

Nervous System

Senses

Endocrine System

Blood

Heart

Blood Vessels and Circulation

The Lymphatic System and Immunity

Respiratory System

Digestive System

Nutrition, Metabolism, and Body Temperature Regulation

Urinary System and Fluid Balance

Reproductive System

Development, Heredity, and Aging

Filters

Exam 7: Muscular System

-The letter A in this figure represents the

The actin myofilaments are anchored into the cytoskeleton of the cell by the __________.

ATP

Which of the following muscles most likely contains motor units that are relatively small (motor neurons that innervate only a small number of muscle fibers each)?

A condition known as flaccid paralysis:

The _______ phase is the time between the application of a stimulus and the beginning of a contraction.

A _________ is a single muscle cell.

Smooth muscle

The ________ is the functional unit of skeletal muscle because it is the smallest portion of the skeletal muscle capable of ___________.

Muscle fibers

The _________ is the smooth ER of a muscle fiber and stores calcium ions.

In skeletal muscle contraction and relaxation, calcium ions

Connective tissue that surrounds the fasciculi is called

Slow-twitch muscle fibers

Extensibility is the ability of skeletal muscle to

Which of the following characteristics would establish conclusively that muscle tissue being examined was skeletal muscle tissue?

An anterior thigh muscle that extends the leg is the

What would happen if the cell membrane suddenly became impermeable to K+ ions?

-The letter B in this figure represents

The Human Organism

The Chemical Basis of Life

Cell Structures and Their Functions

Tissuesasis of Life

Integumentary System

Skeletal System: Bones and Joints

Nervous System

Senses

Endocrine System

Blood

Heart

Blood Vessels and Circulation

The Lymphatic System and Immunity

Respiratory System

Digestive System

Nutrition, Metabolism, and Body Temperature Regulation

Urinary System and Fluid Balance

Reproductive System

Development, Heredity, and Aging

Filters

The is the functional unit of skeletal muscle because it is the smallest portion of the skeletal muscle capable of ___.

What would happen if the cell membrane suddenly became impermeable to K⁺ ions?