Question 1

Which of the following statements regarding cardiac muscle is true?

Accepted Answer

A) Dense bodies anchor thin filaments. 
B) Fibers lack I and A bands. 
C) Intercalated discs contain gap junctions. 
D) Fibers lack branches. 
A) Dense bodies anchor thin filaments. 
B) Fibers lack I and A bands. 
C) Intercalated discs contain gap junctions. 
D) Fibers lack branches.

Question 2

Z discs are found bisecting the A bands.

Accepted Answer

A) True 
 B)False

Question 3

What structure runs the length of the sarcomere and contributes to the elastic recoil in muscle?

Accepted Answer

A) Z disk 
B) titin 
C) M line 
D) actin 
A) Z disk 
B) titin 
C) M line 
D) actin

Question 4

The decline in physical strength of older persons is due to

Accepted Answer

A) decreased size of fast-twitch fibers. 
B) reduced density of blood capillaries. 
C) reduced muscle mass. 
D) All apply. 
A) decreased size of fast-twitch fibers. 
B) reduced density of blood capillaries. 
C) reduced muscle mass. 
D) All apply.

Question 5

The epimysium surrounds the individual muscle cells.

Accepted Answer

A) True 
 B)False

Question 6

Duchenne's muscular dystrophy

Accepted Answer

A) is an X-linked recessive trait. 
B) most often affects women. 
C) involves degeneration of the smooth muscle dense bodies. 
D) All apply. 
A) is an X-linked recessive trait. 
B) most often affects women. 
C) involves degeneration of the smooth muscle dense bodies. 
D) All apply.

Question 7

________ is characterized by continued attachment of myosin heads to actin filaments due to a lack of ATP.

Accepted Answer

A) Tetanus 
B) Rigor mortis 
C) Flaccid paralysis 
D) Treppe 
A) Tetanus 
B) Rigor mortis 
C) Flaccid paralysis 
D) Treppe

Question 8

Repaying the oxygen debt requires replacing oxygen that was

Accepted Answer

A) bound to blood hemoglobin and muscle myoglobin. 
B) needed to metabolize lactic acid. 
C) used for tissue warm up. 
D) All apply. 
A) bound to blood hemoglobin and muscle myoglobin. 
B) needed to metabolize lactic acid. 
C) used for tissue warm up. 
D) All apply.

Question 9

Slow twitch fibers have a ______ oxidative capacity and ________ glycogen content.

Accepted Answer

A) high,high 
B) high,low 
C) low,low 
D) low,high 
A) high,high 
B) high,low 
C) low,low 
D) low,high

Question 10

An increase in plasma creatine phosphokinase could indicate

Accepted Answer

A) muscular dystrophy. 
B) liver disease. 
C) heart attack. 
D) Both muscular dystrophy and heart attack. 
A) muscular dystrophy. 
B) liver disease. 
C) heart attack. 
D) Both muscular dystrophy and heart attack.

Which of the following statements regarding cardiac muscle is true?

Z discs are found bisecting the A bands.

What structure runs the length of the sarcomere and contributes to the elastic recoil in muscle?

The decline in physical strength of older persons is due to

The epimysium surrounds the individual muscle cells.

Duchenne's muscular dystrophy

________ is characterized by continued attachment of myosin heads to actin filaments due to a lack of ATP.

Repaying the oxygen debt requires replacing oxygen that was

Slow twitch fibers have a oxidative capacity and __ glycogen content.

An increase in plasma creatine phosphokinase could indicate

The Study of Body Function

Chemical Composition of the Body

Cell Structure and Genetic Control

Cell Respiration and Metabolism

Interactions Between Cells and the Extracellular Environment

The Nervous System: Neurons and Synapses

The Central Nervous System

The Autonomic Nervous System

Sensory Physiology

Endocrine Glands: Secretion and Action of Hormones

Blood,heart and Circulation

Cardiac Output, blood Flow, and Blood Pressure

The Immune System

Respiratory Physiology

Physiology of the Kidneys

The Digestive System

Regulation and Metabolism

Reproduction

Filters

Exam 12: Muscle: Mechanisms of Contraction and Neural Control

Which of the following statements regarding cardiac muscle is true?

Z discs are found bisecting the A bands.

What structure runs the length of the sarcomere and contributes to the elastic recoil in muscle?

The decline in physical strength of older persons is due to

The epimysium surrounds the individual muscle cells.

Duchenne's muscular dystrophy

________ is characterized by continued attachment of myosin heads to actin filaments due to a lack of ATP.

Repaying the oxygen debt requires replacing oxygen that was

Slow twitch fibers have a ______ oxidative capacity and ________ glycogen content.

An increase in plasma creatine phosphokinase could indicate

The Study of Body Function

Chemical Composition of the Body

Cell Structure and Genetic Control

Cell Respiration and Metabolism

Interactions Between Cells and the Extracellular Environment

The Nervous System: Neurons and Synapses

The Central Nervous System

The Autonomic Nervous System

Sensory Physiology

Endocrine Glands: Secretion and Action of Hormones

Blood,heart and Circulation

Cardiac Output, blood Flow, and Blood Pressure

The Immune System

Respiratory Physiology

Physiology of the Kidneys

The Digestive System

Regulation and Metabolism

Reproduction

Filters

Slow twitch fibers have a oxidative capacity and __ glycogen content.