Question 1

Which of the following is true?

Accepted Answer

A) Skeletal muscle is capable of spontaneous contraction. 
B) Smooth muscle is found in the walls of hollow organs. 
C) Cardiac muscle cells have multiple nuclei. 
D) Smooth muscle cells are long and cylindrical. 
E) There is a small amount of smooth muscle in the heart. 
A) Skeletal muscle is capable of spontaneous contraction. 
B) Smooth muscle is found in the walls of hollow organs. 
C) Cardiac muscle cells have multiple nuclei. 
D) Smooth muscle cells are long and cylindrical. 
E) There is a small amount of smooth muscle in the heart.

Question 2

Betsy took a fall,broke her arm,and when she took the cast off she was alarmed to see that her muscles

Accepted Answer

A)  looked the same as they did before the fall. 
B)  had undergone atrophy. 
C)  undergone hypertrophy. 
D)  seemed to have an increase in blood flow. 
A)  looked the same as they did before the fall. 
B)  had undergone atrophy. 
C)  undergone hypertrophy. 
D)  seemed to have an increase in blood flow.

Question 3

The length of the resting sarcomere is

Accepted Answer

A) longer than the length of a contracted sarcomere. 
B) shorter than the length of a contracted sarcomere. 
C) the same length as a contracted sarcomere. 
D) the same length as the muscle fiber. 
E) the same length as the myofibril. 
A) longer than the length of a contracted sarcomere. 
B) shorter than the length of a contracted sarcomere. 
C) the same length as a contracted sarcomere. 
D) the same length as the muscle fiber. 
E) the same length as the myofibril.

Question 4

Which of the following will respond to a threshold stimulus with an all-or-none contraction?

Accepted Answer

A) a single muscle fiber 
B) a single motor unit 
C) a whole muscle 
D) a single muscle fiber and a single motor unit 
E) a single muscle fiber,a single motor unit,and a whole muscle 
A) a single muscle fiber 
B) a single motor unit 
C) a whole muscle 
D) a single muscle fiber and a single motor unit 
E) a single muscle fiber,a single motor unit,and a whole muscle

Question 5

Which type of muscle tissue is autorhythmic?

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 6

The sarcolemma is the

Accepted Answer

A) cell membrane of a muscle fiber. 
B) cytoplasm of muscle cells. 
C) structural and functional unit of the skeletal muscle cell. 
D) contractile thread that extends the length of the muscle fiber. 
E) protein strand composed of actin. 
A) cell membrane of a muscle fiber. 
B) cytoplasm of muscle cells. 
C) structural and functional unit of the skeletal muscle cell. 
D) contractile thread that extends the length of the muscle fiber. 
E) protein strand composed of actin.

Question 7

-What does "A" represent on the diagram?

Accepted Answer

A) threshold 
B) depolarization 
C) depolarization phase of action potential 
D) repolarization phase of action potential 
A) threshold 
B) depolarization 
C) depolarization phase of action potential 
D) repolarization phase of action potential

Question 8

What is the role of pacemaker cells?

Accepted Answer

A) can rapidly develop action potentials 
B) shallow invaginations of cell membrane 
C) relatively constant tension maintained for a period of time 
D) intracellular cytoskeleton 
E) enzyme that removes phosphate from myosin 
A) can rapidly develop action potentials 
B) shallow invaginations of cell membrane 
C) relatively constant tension maintained for a period of time 
D) intracellular cytoskeleton 
E) enzyme that removes phosphate from myosin

Question 9

Which of the following is mismatched?

Accepted Answer

A) I band - contains only actin 
B) M line - middle of the H zone 
C) Z disk - structure between adjacent sarcomeres 
D) myosin myofilaments - thin myofilaments 
E) actin myofilaments - thin myofilaments 
A) I band - contains only actin 
B) M line - middle of the H zone 
C) Z disk - structure between adjacent sarcomeres 
D) myosin myofilaments - thin myofilaments 
E) actin myofilaments - thin myofilaments

Question 10

What is an oxygen deficit?

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

Question 11

Which of the following causes an unequal ion concentration across the resting plasma membrane?

Accepted Answer

A) the functioning of the sodium-chloride pump 
B) negatively charged proteins do not readily diffuse across the plasma membrane 
C) the attraction of chloride ions to other intracellular anions 
D) the repulsion of potassium ions by the intracellular anions 
E) the attraction of sodium ions to chloride ions 
A) the functioning of the sodium-chloride pump 
B) negatively charged proteins do not readily diffuse across the plasma membrane 
C) the attraction of chloride ions to other intracellular anions 
D) the repulsion of potassium ions by the intracellular anions 
E) the attraction of sodium ions to chloride ions

Question 12

A fasciculus

Accepted Answer

A) is a bundle of reticular fibers. 
B) is surrounded by perimysium. 
C) is only found in smooth muscle. 
D) possesses an external lamina. 
E) is a bundle of collagen fibers. 
A) is a bundle of reticular fibers. 
B) is surrounded by perimysium. 
C) is only found in smooth muscle. 
D) possesses an external lamina. 
E) is a bundle of collagen fibers.

Question 13

Which of the following situations occurs in electrically excitable cells?

Accepted Answer

A) When Na+ ion channels open,K+ ion channels close. 
B) The sodium-potassium pump moves sodium into the cell. 
C) Depolarization causes voltage-gated sodium ion channels to open. 
D) Sodium ion channels are opened by high extracellular calcium levels. 
E) The opening and closing of ligand-gated channels cause depolarization. 
A) When Na+ ion channels open,K+ ion channels close. 
B) The sodium-potassium pump moves sodium into the cell. 
C) Depolarization causes voltage-gated sodium ion channels to open. 
D) Sodium ion channels are opened by high extracellular calcium levels. 
E) The opening and closing of ligand-gated channels cause depolarization.

Question 14

Muscles exhibit the property of excitability.This means that the muscle

Accepted Answer

A) shortens its length. 
B) recoils to its original resting length. 
C) stretches beyond its normal length. 
D) responds to stimulation by the nervous system. 
E) excites itself. 
A) shortens its length. 
B) recoils to its original resting length. 
C) stretches beyond its normal length. 
D) responds to stimulation by the nervous system. 
E) excites itself.

Question 15

You are hired to work in a laboratory to measure the rate of human muscle contraction.Which of the following might decrease in quantity in muscle cells undergoing contractions?

Accepted Answer

A) ATP 
B) carbon dioxide 
C) water 
D) lactic acid 
E) sodium 
A) ATP 
B) carbon dioxide 
C) water 
D) lactic acid 
E) sodium

Question 16

-What does "D" represent on the diagram?

Accepted Answer

A) threshold 
B) depolarization 
C) depolarization phase of action potential 
D) repolarization phase of action potential 
A) threshold 
B) depolarization 
C) depolarization phase of action potential 
D) repolarization phase of action potential

Question 17

What type of muscle tissue has neuromuscular junctions?

Accepted Answer

A) skeletal muscle 
B) smooth muscle 
C) cardiac muscle 
A) skeletal muscle 
B) smooth muscle 
C) cardiac muscle

Question 18

Arrange the following list of biochemical events in the correct sequence. (1)An action potential is conducted deep into the muscle fiber by the T tubule.
(2)Calcium ions bind to troponin.
(3)The membranes of the sarcoplasmic reticulum become more permeable to calcium ions.
(4)Calcium ions diffuse into the sarcoplasm around the myofibril.
(5)The troponin-tropomyosin complex moves exposing active sites.

Accepted Answer

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

Question 19

A sustained muscle contraction is known as

Accepted Answer

A) tetanus 
B) tone 
C) treppe 
D) twitch 
E) paralysis 
A) tetanus 
B) tone 
C) treppe 
D) twitch 
E) paralysis

Question 20

What is a cross-bridge?

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

Which of the following is true?

Betsy took a fall,broke her arm,and when she took the cast off she was alarmed to see that her muscles

The length of the resting sarcomere is

Which of the following will respond to a threshold stimulus with an all-or-none contraction?

Which type of muscle tissue is autorhythmic?

The sarcolemma is the

-What does "A" represent on the diagram?

What is the role of pacemaker cells?

Which of the following is mismatched?

What is an oxygen deficit?

Which of the following causes an unequal ion concentration across the resting plasma membrane?

A fasciculus

Which of the following situations occurs in electrically excitable cells?

Muscles exhibit the property of excitability.This means that the muscle

You are hired to work in a laboratory to measure the rate of human muscle contraction.Which of the following might decrease in quantity in muscle cells undergoing contractions?

-What does "D" represent on the diagram?

What type of muscle tissue has neuromuscular junctions?

A sustained muscle contraction is known as

What is a cross-bridge?

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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