Question 1

What are the swellings on autonomic nerves that release neurotransmitter to smooth muscle called?

Accepted Answer

A) myoneural junctions 
B) gap junctions 
C) neuromuscular junctions 
D) varicosities 
A) myoneural junctions 
B) gap junctions 
C) neuromuscular junctions 
D) varicosities

Question 2

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 3

For a muscle to contract,it must overcome stronger opposing forces.

Accepted Answer

A) True 
 B)False

Question 4

During skeletal muscle contraction the A band decreases in size.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following is true of fast oxidative,Type IIA muscle fibers?

Accepted Answer

A) many capillaries 
B) anaerobic 
C) low myoglobin content 
D) small diameter 
A) many capillaries 
B) anaerobic 
C) low myoglobin content 
D) small diameter

Question 6

Which of the following is needed for the myosin head to undergo a power stroke?

Accepted Answer

A) release of Pi 
B) binding of ATP to the head 
C) splitting of ATP into ADP and Pi 
D) addition of Ca2+ to the head 
A) release of Pi 
B) binding of ATP to the head 
C) splitting of ATP into ADP and Pi 
D) addition of Ca2+ to the head

Question 7

Muscle fatigue

Accepted Answer

A) occurs when muscles are only partially able to contract. 
B) occurs when muscle cell glycogen is depleted. 
C) occurs when muscle cell pH increases. 
D) occurs due to decreased extracellular K+. 
A) occurs when muscles are only partially able to contract. 
B) occurs when muscle cell glycogen is depleted. 
C) occurs when muscle cell pH increases. 
D) occurs due to decreased extracellular K+.

Question 8

The pyramidal tracts include the __________ and _____________ tracts.

Accepted Answer

A) rubrospinal,lateral corticospinal 
B) reticulospinal,ventral corticospinal 
C) ventral corticospinal,lateral corticospinal 
D) rubrospinal,reticulospinal 
A) rubrospinal,lateral corticospinal 
B) reticulospinal,ventral corticospinal 
C) ventral corticospinal,lateral corticospinal 
D) rubrospinal,reticulospinal

Question 9

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.

Question 10

Alpha motoneurons innervate

Accepted Answer

A) nuclear chain fibers. 
B) nuclear bag fibers. 
C) extrafusal fibers. 
D) intrafusal fibers. 
A) nuclear chain fibers. 
B) nuclear bag fibers. 
C) extrafusal fibers. 
D) intrafusal fibers.

What are the swellings on autonomic nerves that release neurotransmitter to smooth muscle called?

The decline in physical strength of older persons is due to

For a muscle to contract,it must overcome stronger opposing forces.

During skeletal muscle contraction the A band decreases in size.

Which of the following is true of fast oxidative,Type IIA muscle fibers?

Which of the following is needed for the myosin head to undergo a power stroke?

Muscle fatigue

The pyramidal tracts include the and ___ tracts.

An increase in plasma creatine phosphokinase could indicate

Alpha motoneurons innervate

The Study of Body Function

Chemical Composition of the Body

Cell Structure and Genetic Control

Enzymes and Energy

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

What are the swellings on autonomic nerves that release neurotransmitter to smooth muscle called?

The decline in physical strength of older persons is due to

For a muscle to contract,it must overcome stronger opposing forces.

During skeletal muscle contraction the A band decreases in size.

Which of the following is true of fast oxidative,Type IIA muscle fibers?

Which of the following is needed for the myosin head to undergo a power stroke?

Muscle fatigue

The pyramidal tracts include the __________ and _____________ tracts.

An increase in plasma creatine phosphokinase could indicate

Alpha motoneurons innervate

The Study of Body Function

Chemical Composition of the Body

Cell Structure and Genetic Control

Enzymes and Energy

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

The pyramidal tracts include the and ___ tracts.