Question 1

Explain what is meant by the graded strength principle of muscle contraction.

Accepted Answer

The graded strength principle of muscle

Question 2

Which of the following statements is incorrect regarding muscle tone?

Accepted Answer

A)  Tonic contractions are another name for muscle tone. 
B)  Muscle tone is important in maintaining posture. 
C)  Muscles with less than normal muscle tone are referred to as spastic. 
D)  All of the above statements are correct. 
A)  Tonic contractions are another name for muscle tone. 
B)  Muscle tone is important in maintaining posture. 
C)  Muscles with less than normal muscle tone are referred to as spastic. 
D)  All of the above statements are correct.

Question 3

Match each term with its corresponding definition or description.
-inward extensions of the sarcolemma that allow impulses to go deeper into the cell

Accepted Answer

A) Actin 
B) Sarcolemma 
C) Contractility 
D) Tropomyosin 
E) Extensibility
F)Myosin
G)T-tubule
H)Irritability
I)Sarcomere
J)Troponin
K)Motor unit 
A) Actin 
B) Sarcolemma 
C) Contractility 
D) Tropomyosin 
E) Extensibility
F)Myosin
G)T-tubule
H)Irritability
I)Sarcomere
J)Troponin
K)Motor unit

Question 4

Which of the following is not associated with the thin myofilament?

Accepted Answer

A)  Troponin 
B)  Tropomyosin 
C)  Actin 
D)  Myosin 
A)  Troponin 
B)  Tropomyosin 
C)  Actin 
D)  Myosin

Question 5

Which type of muscle does not have T-tubules?

Accepted Answer

A)  Smooth 
B)  Cardiac 
C)  Striated 
D)  All muscles have T-tubules. 
A)  Smooth 
B)  Cardiac 
C)  Striated 
D)  All muscles have T-tubules.

Question 6

All of the following are true characteristics of an isometric contraction except:

Accepted Answer

A)  the muscle does not shorten. 
B)  they can produce work by tightening to resist a force. 
C)  movement is produced. 
D)  the tension produced by the myosin cross-bridges cannot overcome the load placed on the muscle. 
A)  the muscle does not shorten. 
B)  they can produce work by tightening to resist a force. 
C)  movement is produced. 
D)  the tension produced by the myosin cross-bridges cannot overcome the load placed on the muscle.

Question 7

Match each term with its corresponding definition or description.
-protein that blocks the receptor sites on the actin molecule

Accepted Answer

A) Actin 
B) Sarcolemma 
C) Contractility 
D) Tropomyosin 
E) Extensibility
F)Myosin
G)T-tubule
H)Irritability
I)Sarcomere
J)Troponin
K)Motor unit 
A) Actin 
B) Sarcolemma 
C) Contractility 
D) Tropomyosin 
E) Extensibility
F)Myosin
G)T-tubule
H)Irritability
I)Sarcomere
J)Troponin
K)Motor unit

Question 8

The protein molecule that has heads jutting out for cross-bridging is:

Accepted Answer

A)  actin. 
B)  myosin. 
C)  troponin. 
D)  tropomyosin. 
A)  actin. 
B)  myosin. 
C)  troponin. 
D)  tropomyosin.

Question 9

The strength of a muscle contraction is influenced by the:

Accepted Answer

A)  amount of load. 
B)  initial length of muscle fibers. 
C)  recruitment of motor units. 
D)  All of the above are correct. 
A)  amount of load. 
B)  initial length of muscle fibers. 
C)  recruitment of motor units. 
D)  All of the above are correct.

Question 10

Which of the following statements about cardiac muscle is incorrect?

Accepted Answer

A)  Cardiac muscle requires nervous stimulation to contract. 
B)  Cardiac muscle is also called striated involuntary muscle. 
C)  Cardiac muscle contains intercalated disks. 
D)  All of the above statements are correct. 
A)  Cardiac muscle requires nervous stimulation to contract. 
B)  Cardiac muscle is also called striated involuntary muscle. 
C)  Cardiac muscle contains intercalated disks. 
D)  All of the above statements are correct.

Question 11

Which of the following is not a name for a muscle cell?

Accepted Answer

A)  Muscle fiber 
B)  Sarcocyte 
C)  Myocyte 
D)  All of the above are names for muscle cells. 
A)  Muscle fiber 
B)  Sarcocyte 
C)  Myocyte 
D)  All of the above are names for muscle cells.

Question 12

Which of the following types of muscle tissue contains cells that have a single nucleus?

Accepted Answer

A)  Cardiac 
B)  Smooth 
C)  Skeletal 
D)  Both A and B 
A)  Cardiac 
B)  Smooth 
C)  Skeletal 
D)  Both A and B

Question 13

Most body movements are _____ contractions.

Accepted Answer

A)  isotonic 
B)  isometric 
C)  a combination of isotonic and isometric 
D)  single twitch 
A)  isotonic 
B)  isometric 
C)  a combination of isotonic and isometric 
D)  single twitch

Question 14

Explain the process of anaerobic respiration in the muscle.What is the oxygen debt,and how is it "repaid"?

Accepted Answer

Anaerobic respiration in the muscle occu

Question 15

Both the skin,or integument,system and the muscle system are important in maintaining the body temperature.The skin function is homeostatic in nature.Explain why the muscle function is not.

Accepted Answer

The skin, or integument, system is impor

Question 16

Physiological muscle fatigue may be caused by:

Accepted Answer

A)  a relative lack of ATP. 
B)  high levels of lactic acid. 
C)  failure of the sodium-potassium pumps. 
D)  all of the above. 
A)  a relative lack of ATP. 
B)  high levels of lactic acid. 
C)  failure of the sodium-potassium pumps. 
D)  all of the above.

Question 17

Which of the following is an incorrect statement regarding heat production?

Accepted Answer

A)  The body temperature set point is established by the hypothalamus. 
B)  Shivering will increase body temperature. 
C)  Body temperature functions on a negative feedback mechanism. 
D)  All of the above are correct. 
A)  The body temperature set point is established by the hypothalamus. 
B)  Shivering will increase body temperature. 
C)  Body temperature functions on a negative feedback mechanism. 
D)  All of the above are correct.

Question 18

Which of the following statements about cardiac muscle is incorrect?

Accepted Answer

A)  Cardiac muscle forms an electrically coupled mass called a syncytium. 
B)  Much of the calcium necessary for contraction comes from outside the cell. 
C)  In cardiac muscles, the T-tubules form diads rather than the triads formed in skeletal muscles. 
D)  All of the above statements are correct. 
A)  Cardiac muscle forms an electrically coupled mass called a syncytium. 
B)  Much of the calcium necessary for contraction comes from outside the cell. 
C)  In cardiac muscles, the T-tubules form diads rather than the triads formed in skeletal muscles. 
D)  All of the above statements are correct.

Question 19

Name and describe the myofilament fibers in the sarcomere.

Accepted Answer

The sarcomere is the basic contractile u

Question 20

In the structure called a triad,the T-tubule is sandwiched between:

Accepted Answer

A)  actin filaments. 
B)  myofibrils. 
C)  sarcolemmas. 
D)  sacs of sarcoplasmic reticulum. 
A)  actin filaments. 
B)  myofibrils. 
C)  sarcolemmas. 
D)  sacs of sarcoplasmic reticulum.

Exam 12: B: Physiology of the Muscular System

Explain what is meant by the graded strength principle of muscle contraction.

Which of the following statements is incorrect regarding muscle tone?

Match each term with its corresponding definition or description. -inward extensions of the sarcolemma that allow impulses to go deeper into the cell

Which of the following is not associated with the thin myofilament?

Which type of muscle does not have T-tubules?

All of the following are true characteristics of an isometric contraction except:

Match each term with its corresponding definition or description. -protein that blocks the receptor sites on the actin molecule

The protein molecule that has heads jutting out for cross-bridging is:

The strength of a muscle contraction is influenced by the:

Which of the following statements about cardiac muscle is incorrect?

Which of the following is not a name for a muscle cell?

Which of the following types of muscle tissue contains cells that have a single nucleus?

Most body movements are _____ contractions.

Explain the process of anaerobic respiration in the muscle.What is the oxygen debt,and how is it "repaid"?

Both the skin,or integument,system and the muscle system are important in maintaining the body temperature.The skin function is homeostatic in nature.Explain why the muscle function is not.

Physiological muscle fatigue may be caused by:

Which of the following is an incorrect statement regarding heat production?

Which of the following statements about cardiac muscle is incorrect?

Name and describe the myofilament fibers in the sarcomere.

In the structure called a triad,the T-tubule is sandwiched between:

A: Organization of the Body

B: Organization of the Body

A: The Chemical Basis of Life

B: The Chemical Basis of Life

A: Anatomy of Cells

B: Anatomy of Cells

Physiology of Cells

Cell Growth and Reproduction

Tissues

A: Skin and Its Appendages

B: Skin and Its Appendages

A: Skeletal Tissues

B: Skeletal Tissues

Skeletal System

A: Articulations

B: Articulations

A: Anatomy of the Muscular System

B: Anatomy of the Muscular System

A: Physiology of the Muscular System

A: Nervous System Cells

B: Nervous System Cells

A: Central Nervous System

B: Central Nervous System

Peripheral Nervous System

Autonomic Nervous System

A: Sense Organs

B: Sense Organs

Endocrine System

Endocrine Glands

Blood

Anatomy of the Cardiovascular System

A: Physiology of the Cardiovascular System

B: Physiology of the Cardiovascular System

Lymphatic System

A: Immune System

B: Immune System

Stress

Anatomy of the Respiratory System

A: Physiology of the Respiratory System

B: Physiology of the Respiratory System

A: Anatomy of the Digestive System

B: Anatomy of the Digestive System

A: Physiology of the Digestive System

B: Physiology of the Digestive System

A: Nutrition and Metabolism

B: Nutrition and Metabolism

A: Urinary System

B: Urinary System

Fluid and Electrolyte Balance

Acid-Base Balance

Male Reproductive System

A: Female Reproductive System

B: Female Reproductive System

A: Growth and Development

B: Growth and Development

A: Genetics and Heredity

B: Genetics and Heredity

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