Question 1

The sites where a chemical substance is transmitted from the presynaptic terminal of an axon to the postsynaptic membrane of a muscle fiber are called

Accepted Answer

A) neuromuscular junctions. 
B) sarcomeres. 
C) myofilaments. 
D) Z disks. 
E) cell body of neuron. 
A) neuromuscular junctions. 
B) sarcomeres. 
C) myofilaments. 
D) Z disks. 
E) cell body of neuron.

Question 2

Which type of muscle tissue is multinucleated?

Accepted Answer

A) skeletal muscle 
B) smooth muscle 
C) cardiac muscle 
D) both skeletal and cardiac muscle 
E) both cardiac and smooth muscle 
A) skeletal muscle 
B) smooth muscle 
C) cardiac muscle 
D) both skeletal and cardiac muscle 
E) both cardiac and smooth muscle

Question 3

The elevated oxygen consumption relative to activity level after exercise has ended is called

Accepted Answer

A) oxygen deficit. 
B) oxygen debt. 
C) oxygen repayment. 
D) recovery oxygen consumption. 
E) anaerobic recovery. 
A) oxygen deficit. 
B) oxygen debt. 
C) oxygen repayment. 
D) recovery oxygen consumption. 
E) anaerobic recovery.

Question 4

In which of the following situations does a resting membrane potential exist?

Accepted Answer

A) a relaxed muscle fiber 
B) a conducting neuron 
C) a stimulated sensory receptor in the skin 
D) a contracting cardiac muscle cell 
E) the eye seeing an image 
A) a relaxed muscle fiber 
B) a conducting neuron 
C) a stimulated sensory receptor in the skin 
D) a contracting cardiac muscle cell 
E) the eye seeing an image

Question 5

The condition of painful,spasmodic contractions of muscles is referred to as

Accepted Answer

A) cramps. 
B) fibrositis. 
C) fibromyalgia. 
D) muscular dystrophy. 
E) paralysis. 
A) cramps. 
B) fibrositis. 
C) fibromyalgia. 
D) muscular dystrophy. 
E) paralysis.

Question 6

When repolarization of the cell membrane is complete,the

Accepted Answer

A) cell dies. 
B) cell regenerates. 
C) cell no longer has a potential difference across its membrane. 
D) cell is no longer responsive. 
E) original polarity of the cell is restored. 
A) cell dies. 
B) cell regenerates. 
C) cell no longer has a potential difference across its membrane. 
D) cell is no longer responsive. 
E) original polarity of the cell is restored.

Question 7

After contraction has occurred,the calcium is

Accepted Answer

A) destroyed by cholinesterase. 
B) chemically bound to the cross bridges. 
C) secreted by the Golgi apparatus to the outside of the cell. 
D) released from troponin. 
E) returned to the sarcolemma. 
A) destroyed by cholinesterase. 
B) chemically bound to the cross bridges. 
C) secreted by the Golgi apparatus to the outside of the cell. 
D) released from troponin. 
E) returned to the sarcolemma.

Question 8

Which of the following statements concerning smooth muscle is true?

Accepted Answer

A) It contains many sarcomeres. 
B) Caveolae seem to take the place of the myofibrils. 
C) A calcium-calmodulin complex initiates cross-bridge formation. 
D) The cells are large and multinuclear. 
E) It has a well developed sarcoplasmic reticulum. 
A) It contains many sarcomeres. 
B) Caveolae seem to take the place of the myofibrils. 
C) A calcium-calmodulin complex initiates cross-bridge formation. 
D) The cells are large and multinuclear. 
E) It has a well developed sarcoplasmic reticulum.

Question 9

When the myosin head flexes into a bend,pulling the actin filament along with it,this is called the

Accepted Answer

A) action reaction. 
B) power stroke. 
C) recovery stroke. 
D) muscle tone. 
E) action potential. 
A) action reaction. 
B) power stroke. 
C) recovery stroke. 
D) muscle tone. 
E) action potential.

Question 10

Functionally,smooth muscle

Accepted Answer

A) is well adapted to anaerobic metabolism. 
B) exhibits autorhythmic contractions. 
C) contracts in response to slow increases in length. 
D) is unable to maintain tone. 
E) rapidly develops an oxygen debt. 
A) is well adapted to anaerobic metabolism. 
B) exhibits autorhythmic contractions. 
C) contracts in response to slow increases in length. 
D) is unable to maintain tone. 
E) rapidly develops an oxygen debt.

Question 11

Randy is participating in a strong man competition and is required to pull a yacht as far as he can.Which type of chemical process will his skeletal muscles rely on during this competition?

Accepted Answer

A) anaerobic respiration 
B) aerobic respiration 
C) both anaerobic and aerobic respiration 
A) anaerobic respiration 
B) aerobic respiration 
C) both anaerobic and aerobic respiration

Question 12

A muscle fiber will respond to a stimulus when that stimulus reaches the _____ level.

Accepted Answer

A) threshold 
B) relaxation 
C) rigor mortis 
D) recruitment 
E) resting 
A) threshold 
B) relaxation 
C) rigor mortis 
D) recruitment 
E) resting

Question 13

Which of the following is NOT an age related change in skeletal muscle?

Accepted Answer

A) loss of muscle strength 
B) loss of synapse surface area 
C) loss of fast-twitch fibers 
D) decreased recovery time 
E) decrease in motor units 
A) loss of muscle strength 
B) loss of synapse surface area 
C) loss of fast-twitch fibers 
D) decreased recovery time 
E) decrease in motor units

Question 14

T tubules

Accepted Answer

A) provide nutrients to the muscle fiber. 
B) generate new muscle fibers. 
C) conduct action potentials deep into the muscle cell. 
D) release acetylcholine. 
E) store calcium ions. 
A) provide nutrients to the muscle fiber. 
B) generate new muscle fibers. 
C) conduct action potentials deep into the muscle cell. 
D) release acetylcholine. 
E) store calcium ions.

Question 15

Multiunit smooth muscle is located in the

Accepted Answer

A) gastrocnemius. 
B) wall of the GI tract. 
C) wall of blood vessels. 
D) wall of the heart. 
E) reproductive system. 
A) gastrocnemius. 
B) wall of the GI tract. 
C) wall of blood vessels. 
D) wall of the heart. 
E) reproductive system.

Question 16

A stimulus either causes an action potential or it doesn't.This is called

Accepted Answer

A) an all-or-none response. 
B) a graded response. 
C) a latent period response. 
D) a relative refractory response. 
E) an arbitrary response. 
A) an all-or-none response. 
B) a graded response. 
C) a latent period response. 
D) a relative refractory response. 
E) an arbitrary response.

Question 17

Epimysium

Accepted Answer

A) surrounds individual muscles. 
B) separates muscle fibers. 
C) connects muscles to bone. 
D) is a type of muscle tissue. 
E) is a type of nerve tissue. 
A) surrounds individual muscles. 
B) separates muscle fibers. 
C) connects muscles to bone. 
D) is a type of muscle tissue. 
E) is a type of nerve tissue.

Question 18

Which of the following occurs during recovery from oxygen deficit?

Accepted Answer

A) an elevated level of anaerobic metabolism 
B) depletion of reserves of creatine phosphate 
C) conversion of excess lactic acid to glucose 
D) glycogen degradation to provide creatine 
E) depressed level of aerobic respiration 
A) an elevated level of anaerobic metabolism 
B) depletion of reserves of creatine phosphate 
C) conversion of excess lactic acid to glucose 
D) glycogen degradation to provide creatine 
E) depressed level of aerobic respiration

Question 19

Identify the statement concerning skeletal muscle that is true.

Accepted Answer

A) It comprises about 20% of the body's weight. 
B) It propels urine through the urinary tract. 
C) Its function is largely under involuntary control. 
D) It is a kind of connective tissue. 
E) It is responsible for locomotion. 
A) It comprises about 20% of the body's weight. 
B) It propels urine through the urinary tract. 
C) Its function is largely under involuntary control. 
D) It is a kind of connective tissue. 
E) It is responsible for locomotion.

Question 20

What is tropomyosin?

Accepted Answer

A) a protein found along the groove of the F-actin double helix 
B) a T tubule and two adjacent terminal cisternae 
C) the combination of myosin heads with active sites on actin molecules 
D) the movement of myosin head while attached to actin myofilament 
E) after exercise,the oxygen taken in that exceeds the oxygen required for resting metabolism 
A) a protein found along the groove of the F-actin double helix 
B) a T tubule and two adjacent terminal cisternae 
C) the combination of myosin heads with active sites on actin molecules 
D) the movement of myosin head while attached to actin myofilament 
E) after exercise,the oxygen taken in that exceeds the oxygen required for resting metabolism

Exam 9: Muscular System: Histology and Physiology

The sites where a chemical substance is transmitted from the presynaptic terminal of an axon to the postsynaptic membrane of a muscle fiber are called

Which type of muscle tissue is multinucleated?

The elevated oxygen consumption relative to activity level after exercise has ended is called

In which of the following situations does a resting membrane potential exist?

The condition of painful,spasmodic contractions of muscles is referred to as

When repolarization of the cell membrane is complete,the

After contraction has occurred,the calcium is

Which of the following statements concerning smooth muscle is true?

When the myosin head flexes into a bend,pulling the actin filament along with it,this is called the

Functionally,smooth muscle

Randy is participating in a strong man competition and is required to pull a yacht as far as he can.Which type of chemical process will his skeletal muscles rely on during this competition?

A muscle fiber will respond to a stimulus when that stimulus reaches the _____ level.

Which of the following is NOT an age related change in skeletal muscle?

T tubules

Multiunit smooth muscle is located in the

A stimulus either causes an action potential or it doesn't.This is called

Epimysium

Which of the following occurs during recovery from oxygen deficit?

Identify the statement concerning skeletal muscle that is true.

What is tropomyosin?

The Human Organism

The Chemical Basis of Life

Cell Biology

Tissues

Integumentary System

Skeletal System: Bones and Bone Tissue

Skeletal System: Gross Anatomy

Joints and Movement

Muscular System: Gross Anatomy

Functional Organization of Nervous Tissue

Spinal Cord and Spinal Nerves

Brain and Cranial Nerves

Integration of Nervous System Functions

The Special Senses

Autonomic Nervous System

Functional Organization of the Endocrine System

Endocrine Glands

Cardiovascular System: Blood

Cardiovascular System: the Heart

Cardiovascular System: Blood Vessels and Circulation

Lymphatic System and Immunity

Respiratory System

Digestive System

Nutrition,metabolism,and Temperature Regulation

Urinary System

Water,electrolyte,and Acid-Based Balance

Reproductive System

Development,growth,aging,and Genetics

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