Question 1

Foot proteins link the actin molecules together within a thin filament.

Accepted Answer

A) True 
 B)False

Question 2

All smooth muscle is myogenic.

Accepted Answer

A) True 
 B)False

Question 3

Calcium that enters the cell during smooth muscle excitation binds with

Accepted Answer

A)  calmodulin 
B)  inactive myosin kinase 
C)  troponin 
D)  myosin 
E)  actin 
A)  calmodulin 
B)  inactive myosin kinase 
C)  troponin 
D)  myosin 
E)  actin

Question 4

Which statement is incorrect?

Accepted Answer

A)  Smooth muscle can develop less tension per unit cross-sectional area compared to skeletal muscle. 
B)  Smooth muscle can maintain tension with comparatively less ATP consumption than skeletal muscle. 
C)  Smooth muscle lacks troponin and tropomyosin. 
D)  The range of lengths over which smooth muscle is able to develop near maximal tension is much greater than for skeletal muscle. 
E)  A hollow organ enclosed by smooth muscle accommodates variable volumes with little change in the pressure exerted on the contents. 
A)  Smooth muscle can develop less tension per unit cross-sectional area compared to skeletal muscle. 
B)  Smooth muscle can maintain tension with comparatively less ATP consumption than skeletal muscle. 
C)  Smooth muscle lacks troponin and tropomyosin. 
D)  The range of lengths over which smooth muscle is able to develop near maximal tension is much greater than for skeletal muscle. 
E)  A hollow organ enclosed by smooth muscle accommodates variable volumes with little change in the pressure exerted on the contents.

Question 5

In twitch summation:

Accepted Answer

A)  The muscle fiber is stimulated again before the action potential has returned to resting potential. 
B)  The muscle fiber is stimulated again before the filaments have completely returned to their resting position. 
C)  Stronger muscle contractions occur but stronger action potentials do not occur. 
D)  The muscle fiber is stimulated again before the action potential has returned to resting potential, and stronger muscle contractions occur but stronger action potentials do not occur. 
E)  The muscle fiber is stimulated again before the filaments have completely returned to their resting position, and stronger muscle contractions occur but stronger action potentials do not occur. 
A)  The muscle fiber is stimulated again before the action potential has returned to resting potential. 
B)  The muscle fiber is stimulated again before the filaments have completely returned to their resting position. 
C)  Stronger muscle contractions occur but stronger action potentials do not occur. 
D)  The muscle fiber is stimulated again before the action potential has returned to resting potential, and stronger muscle contractions occur but stronger action potentials do not occur. 
E)  The muscle fiber is stimulated again before the filaments have completely returned to their resting position, and stronger muscle contractions occur but stronger action potentials do not occur.

Question 6

The skeletal muscle shortens during concentric, isotonic contraction.

Accepted Answer

A) True 
 B)False

Question 7

The T tubule is lined with the muscle cell's membrane.

Accepted Answer

A) True 
 B)False

Question 8

Sarcomeres are arranged end to end as

Accepted Answer

A)  fascicles 
B)  myofibrils 
C)  bands 
D)  perimysia 
E)  none of these 
A)  fascicles 
B)  myofibrils 
C)  bands 
D)  perimysia 
E)  none of these

Question 9

Complete each of the following statments.
____________________ and ____________________ are referred to as contractile proteins, whereas ____________________ and ____________________ are referred to as regulatory proteins.

Accepted Answer

Myosin, ac

Question 10

Complete each of the following statments.
The neurotransmitter called ____________________ stimulates skeletal muscles to contract.

Accepted Answer

The answer of Complete each of the following statments.
The neurotransmitter...

Question 11

The metabolic capability of a muscle fiber can affect the degree of tension it can develop.

Accepted Answer

A) True 
 B)False

Question 12

With twitch summation, the muscle fiber is stimulated so rapidly that it does not have an opportunity to return to resting potential between stimuli.

Accepted Answer

A) True 
 B)False

Question 13

Muscles developing tension while lengthening are performing ____ contractions.

Accepted Answer

A)  concentric 
B)  eccentric 
C)  isometric 
D)  fatiguing 
E)  oscillating 
A)  concentric 
B)  eccentric 
C)  isometric 
D)  fatiguing 
E)  oscillating

Question 14

Complete each of the following statments.
The ____________________ is the descending motor pathway that mediates performance of fine, discrete voluntary movements of the hands.

Accepted Answer

corticospi

Question 15

Complete each of the following statments.
Thick filaments are made up of the protein ____________________, whereas thin filaments are composed of the three proteins ____________________, ____________________, and ____________________.

Accepted Answer

myosin, ac

Question 16

Which statement below is characteristic of most of the body's lever systems?

Accepted Answer

A)  They work at mechanical advantage. 
B)  They work at a mechanical disadvantage. 
C)  Muscles must exert greater forces than the load. 
D)  They work at mechanical advantage and at a mechanical disadvantage. 
E)  They work at a mechanical disadvantage, and muscles must exert greater forces than the load. 
A)  They work at mechanical advantage. 
B)  They work at a mechanical disadvantage. 
C)  Muscles must exert greater forces than the load. 
D)  They work at mechanical advantage and at a mechanical disadvantage. 
E)  They work at a mechanical disadvantage, and muscles must exert greater forces than the load.

Question 17

Muscle tension does not change in isometric contractions.

Accepted Answer

A) True 
 B)False

Question 18

Complete each of the following statments.
____________________ is the descending pathway that is primarily concerned with regulation of posture involving involuntary movements of the trunk and limbs.

Accepted Answer

Multineuro

Question 19

What is responsible for initiating contraction of smooth muscle?

Accepted Answer

A)  stimulation by motor neurons 
B)  inhibition of acetylcholinesterase 
C)  membrane potential drifting to threshold as a result of automatic changes in ion movement across the membrane 
D)  excitation of the gap junctions by transmitter substance 
E)  stimulation by the autonomic nervous system 
A)  stimulation by motor neurons 
B)  inhibition of acetylcholinesterase 
C)  membrane potential drifting to threshold as a result of automatic changes in ion movement across the membrane 
D)  excitation of the gap junctions by transmitter substance 
E)  stimulation by the autonomic nervous system

Question 20

Most muscle-lever systems work at a mechanical disadvantage.

Accepted Answer

A) True 
 B)False

Exam 8: A--Muscle Physiology

Foot proteins link the actin molecules together within a thin filament.

All smooth muscle is myogenic.

Calcium that enters the cell during smooth muscle excitation binds with

Which statement is incorrect?

In twitch summation:

The skeletal muscle shortens during concentric, isotonic contraction.

The T tubule is lined with the muscle cell's membrane.

Sarcomeres are arranged end to end as

Complete each of the following statments. ____________________ and ____________________ are referred to as contractile proteins, whereas ____________________ and ____________________ are referred to as regulatory proteins.

Complete each of the following statments. The neurotransmitter called ____________________ stimulates skeletal muscles to contract.

The metabolic capability of a muscle fiber can affect the degree of tension it can develop.

With twitch summation, the muscle fiber is stimulated so rapidly that it does not have an opportunity to return to resting potential between stimuli.

Muscles developing tension while lengthening are performing ____ contractions.

Complete each of the following statments. The ____________________ is the descending motor pathway that mediates performance of fine, discrete voluntary movements of the hands.

Complete each of the following statments. Thick filaments are made up of the protein ____________________, whereas thin filaments are composed of the three proteins ____________________, ____________________, and ____________________.

Which statement below is characteristic of most of the body's lever systems?

Muscle tension does not change in isometric contractions.

Complete each of the following statments. ____________________ is the descending pathway that is primarily concerned with regulation of posture involving involuntary movements of the trunk and limbs.

What is responsible for initiating contraction of smooth muscle?

Most muscle-lever systems work at a mechanical disadvantage.

Introduction to Physiology and Homeostasis

Cell Physiology

The Plasma Membrane and Membrane Potential

Principles of Neural and Hormonal Communication

A--The Central Nervous System

B--The Central Nervous System

A--The Peripheral Nervous System: Afferent Division; Special Senses

B--The Peripheral Nervous System: Afferent Division; Special Senses

The Peripheral Nervous System: Efferent Division

B--Muscle Physiology

A--Cardiac Physiology

B--Cardiac Physiology

The Blood Vessels and Blood Pressure

The Blood

Body Defenses

A--The Respiratory System

B--The Respiratory System

A--The Urinary System

B--The Urinary System

A--Fluid and Acid-Base Balance

B--Fluid and Acid-Base Balance

A--The Digestive System

B--The Digestive System

Energy Balance and Temperature Regulation

A--Principles of Endocrinology: the Central Endocrine Glands

B--Principles of Endocrinology: the Central Endocrine Glands

A--The Peripheral Endocrine Glands

B--The Peripheral Endocrine Glands

A--The Reproductive System

B--The Reproductive System

Filters

Complete each of the following statments. and are referred to as contractile proteins, whereas and are referred to as regulatory proteins.

Complete each of the following statments. Thick filaments are made up of the protein , whereas thin filaments are composed of the three proteins , , and .