Question 1

What causes the striated appearance of skeletal muscle?

Accepted Answer

A) regular arrangement of the T tubules running transversely through the muscle fibre 
B) presence of the Z lines extending down the middle of the I bands 
C)  presence of gap junctions 
D)  regular arrangement of highly organized thick and thin filaments 
A) regular arrangement of the T tubules running transversely through the muscle fibre 
B) presence of the Z lines extending down the middle of the I bands 
C)  presence of gap junctions 
D)  regular arrangement of highly organized thick and thin filaments

Question 2

Match the muscle fibre types, labelled a. through c., with the characteristics. (Options may be used more than once or not at all.)
a.slow-oxidative fibre
b.fast-oxidative fibre
c.fast-glycolytic fibre
-has abundant glycolytic enzymes

Accepted Answer

The answer of Match the muscle fibre types, labelled a....

Question 3

Increasing the number of recruited motor units in a muscle increases its force or strength of contraction.

Accepted Answer

A) True 
 B)False

Question 4

Oxygen debt is the oxygen a skeletal muscle produces or pays off when it carries out glycolysis.

Accepted Answer

A) True 
 B)False

Question 5

Which of these components are involved with regulation of cross-bridge attachment activity?

Accepted Answer

A) calcium ions and troponin 
B) troponin and titin 
C)  tropomyosin and calmodulin 
D)  titin only 
A) calcium ions and troponin 
B) troponin and titin 
C)  tropomyosin and calmodulin 
D)  titin only

Question 6

The immediate source of additional ATP in muscle fibres is ____________________.

Accepted Answer

The answer of The immediate source of additional ATP in...

Question 7

Which of these statements correctly describes twitch summation?

Accepted Answer

A) It is a means by which weak muscle contraction may be accomplished. 
B) It results from increasing the number of motor units that are firing within a muscle. 
C)  A high level of calcium ion is not required in twitch summation. 
D)  It results from increasing the frequency at which motor units are firing within a muscle. 
A) It is a means by which weak muscle contraction may be accomplished. 
B) It results from increasing the number of motor units that are firing within a muscle. 
C)  A high level of calcium ion is not required in twitch summation. 
D)  It results from increasing the frequency at which motor units are firing within a muscle.

Question 8

Match the bands, labelled a. through c., with the descriptions. (Options may be used more than once or not at all.)
a.A band
b.I band
c.H zone
-composed of thick filaments only

Accepted Answer

The answer of Match the bands, labelled a. through c.,...

Question 9

____________________ and ____________________ are referred to as contractile proteins, whereas ____________________ and ____________________ are referred to as regulatory proteins.

Accepted Answer

Myosin; actin; tropomyosin; tr

Question 10

What are the means by which skeletal muscle fibres utilize energy for contraction?

Accepted Answer

The answer of What are the means by which skeletal...

Question 11

In a state of ____________________, a muscle cannot maintain any kind of tension.

Accepted Answer

The answer of In a state of ____________________, a muscle...

Question 12

Cross bridges have actin binding sites that are normally covered by troponin and tropomyosin, except during excitation-contraction coupling.

Accepted Answer

A) True 
 B)False

Question 13

Muscle tension does not develop in isometric contractions.

Accepted Answer

A) True 
 B)False

Question 14

Which of these statements correctly describes why you are able to repeatedly contract and relax your muscles of respiration, allowing you to breathe in and breathe out?

Accepted Answer

A) As soon as all the Ca2+ stored in the lateral sacs of the sarcoplasmic reticulum is used up, muscle relaxation occurs. 
B) After the muscle cells become excited, acetylcholinesterase maintains the action of acetylcholine. 
C)  When there is no longer a local action potential in the muscle cell, Ca2+ is actively transported back into the lateral sacs of the sarcoplasmic reticulum. 
D)  ATP is not available soon after the contraction. 
A) As soon as all the Ca2+ stored in the lateral sacs of the sarcoplasmic reticulum is used up, muscle relaxation occurs. 
B) After the muscle cells become excited, acetylcholinesterase maintains the action of acetylcholine. 
C)  When there is no longer a local action potential in the muscle cell, Ca2+ is actively transported back into the lateral sacs of the sarcoplasmic reticulum. 
D)  ATP is not available soon after the contraction.

Question 15

____________________ is the pigment that can store small amounts of oxygen in the skeletal muscle.

Accepted Answer

The answer of ____________________ is the pigment that can store...

Question 16

Match the muscle fibre types, labelled a. through c., with the characteristics. (Options may be used more than once or not at all.)
a.slow-oxidative fibre
b.fast-oxidative fibre
c.fast-glycolytic fibre
-found predominantly in muscles designed for endurance

Accepted Answer

The answer of Match the muscle fibre types, labelled a....

Question 17

Which of these statements correctly describes troponin?

Accepted Answer

A) It binds with calcium during contraction of skeletal muscle. 
B) It breaks down actin. 
C)  It breaks down myosin. 
D)  It forms the boundaries of a sarcomere. 
A) It binds with calcium during contraction of skeletal muscle. 
B) It breaks down actin. 
C)  It breaks down myosin. 
D)  It forms the boundaries of a sarcomere.

Question 18

When does spastic paralysis occur?

Accepted Answer

A) when descending excitatory pathways are destroyed 
B) when excitatory inputs to motor neurons are unopposed because of disruption of an inhibitory system in the brain stem 
C)  when muscle spindles are destroyed 
D)  when the cerebellum is damaged 
A) when descending excitatory pathways are destroyed 
B) when excitatory inputs to motor neurons are unopposed because of disruption of an inhibitory system in the brain stem 
C)  when muscle spindles are destroyed 
D)  when the cerebellum is damaged

Question 19

Match the types of muscles, labelled a. through g., with the properties in question. (Options may be used more than once or not at all.)
a.skeletal muscle only
b.single-unit smooth muscle only
c.cardiac muscle only
d.skeletal muscle and cardiac muscle
e.skeletal muscle and single-unit smooth muscle
f.single-unit smooth muscle and cardiac muscle
g.skeletal, single-unit smooth, and cardiac muscles
-has/have a clear-cut, length-tension relationship

Accepted Answer

The answer of Match the types of muscles, labelled a....

Question 20

In an isotonic contraction, only 25 percent of the energy consumed is realized as external work, and the remaining 75 percent is converted to heat.

Accepted Answer

A) True 
 B)False

What causes the striated appearance of skeletal muscle?

Match the muscle fibre types, labelled a. through c., with the characteristics. (Options may be used more than once or not at all.) a.slow-oxidative fibre b.fast-oxidative fibre c.fast-glycolytic fibre -has abundant glycolytic enzymes

Increasing the number of recruited motor units in a muscle increases its force or strength of contraction.

Oxygen debt is the oxygen a skeletal muscle produces or pays off when it carries out glycolysis.

Which of these components are involved with regulation of cross-bridge attachment activity?

The immediate source of additional ATP in muscle fibres is ____________________.

Which of these statements correctly describes twitch summation?

Match the bands, labelled a. through c., with the descriptions. (Options may be used more than once or not at all.) a.A band b.I band c.H zone -composed of thick filaments only

and are referred to as contractile proteins, whereas and are referred to as regulatory proteins.

What are the means by which skeletal muscle fibres utilize energy for contraction?

In a state of ____________________, a muscle cannot maintain any kind of tension.

Cross bridges have actin binding sites that are normally covered by troponin and tropomyosin, except during excitation-contraction coupling.

Muscle tension does not develop in isometric contractions.

Which of these statements correctly describes why you are able to repeatedly contract and relax your muscles of respiration, allowing you to breathe in and breathe out?

____________________ is the pigment that can store small amounts of oxygen in the skeletal muscle.

Match the muscle fibre types, labelled a. through c., with the characteristics. (Options may be used more than once or not at all.) a.slow-oxidative fibre b.fast-oxidative fibre c.fast-glycolytic fibre -found predominantly in muscles designed for endurance

Which of these statements correctly describes troponin?

When does spastic paralysis occur?

In an isotonic contraction, only 25 percent of the energy consumed is realized as external work, and the remaining 75 percent is converted to heat.

Introduction to Physiology and Homeostasis

Cell Physiology

The Plasma Membrane and Membrane Potential

Principles of Neural and Hormonal Communication

The Central Nervous System

The Peripheral Nervous System: Efferent Division

Muscle Physiology

Cardiac Physiology

The Blood Vessels and Blood Pressure

The Blood

Body Defenses

The Respiratory System

The Urinary System

Fluid and Acidbase Balance

The Digestive System

Energy Balance and Temperature Regulation

Filters

Exam 6: The Peripheral Nervous System: Afferent Division; Special Senses

What causes the striated appearance of skeletal muscle?

Match the muscle fibre types, labelled a. through c., with the characteristics. (Options may be used more than once or not at all.) a.slow-oxidative fibre b.fast-oxidative fibre c.fast-glycolytic fibre -has abundant glycolytic enzymes

Increasing the number of recruited motor units in a muscle increases its force or strength of contraction.

Oxygen debt is the oxygen a skeletal muscle produces or pays off when it carries out glycolysis.

Which of these components are involved with regulation of cross-bridge attachment activity?

The immediate source of additional ATP in muscle fibres is ____________________.

Which of these statements correctly describes twitch summation?

Match the bands, labelled a. through c., with the descriptions. (Options may be used more than once or not at all.) a.A band b.I band c.H zone -composed of thick filaments only

____________________ and ____________________ are referred to as contractile proteins, whereas ____________________ and ____________________ are referred to as regulatory proteins.

What are the means by which skeletal muscle fibres utilize energy for contraction?

In a state of ____________________, a muscle cannot maintain any kind of tension.

Cross bridges have actin binding sites that are normally covered by troponin and tropomyosin, except during excitation-contraction coupling.

Muscle tension does not develop in isometric contractions.

Which of these statements correctly describes why you are able to repeatedly contract and relax your muscles of respiration, allowing you to breathe in and breathe out?

____________________ is the pigment that can store small amounts of oxygen in the skeletal muscle.

Match the muscle fibre types, labelled a. through c., with the characteristics. (Options may be used more than once or not at all.) a.slow-oxidative fibre b.fast-oxidative fibre c.fast-glycolytic fibre -found predominantly in muscles designed for endurance

Which of these statements correctly describes troponin?

When does spastic paralysis occur?

In an isotonic contraction, only 25 percent of the energy consumed is realized as external work, and the remaining 75 percent is converted to heat.

Introduction to Physiology and Homeostasis

Cell Physiology

The Plasma Membrane and Membrane Potential

Principles of Neural and Hormonal Communication

The Central Nervous System

The Peripheral Nervous System: Efferent Division

Muscle Physiology

Cardiac Physiology

The Blood Vessels and Blood Pressure

The Blood

Body Defenses

The Respiratory System

The Urinary System

Fluid and Acidbase Balance

The Digestive System

Energy Balance and Temperature Regulation

Filters

and are referred to as contractile proteins, whereas and are referred to as regulatory proteins.