Human A&P Exam 3 Flashcards


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1
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Using Figure 9.1, match the following:

1) Endomysium.

2) Fascicle.

3) The tissue that binds muscles into functional groups.

4) Perimysium.

5) Muscle fiber.

1) B

2) D

3) A

4) E

5) C

2
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Using Figure 9.2, match the following:

6) I band.

7) H zone.

8) A band.

9) Z disc.

10) M line

6) C

7) B

8) D

9) A

10) E

3

Match the following:

A) Slow (oxidative), fatigue-resistant fibers

B) Fast (oxidative or glycolytic), fatigable fibers

11) Depends on oxygen delivery and aerobic mechanisms.

12) Have very fast-acting myosin ATPases and depend upon anaerobic metabolism during contraction.

13) Red fibers, the smallest of the fiber types.

14) Contain abundant amounts of glycogen.

15) Abundant in muscles used to maintain posture.

16) A relatively high percentage are found in successful marathon runners.

11) A

12) B

13) A

14) B

15) A

16) A

4

Once a motor neuron has fired, all the muscle fibers in a muscle contract.

False

5

The thin filaments (actin) contain a polypeptide subunit G actin that bear active sites for myosin attachment.

True

6

A contraction in which the muscle does not shorten but its tension increases is called isometric contraction.

True

7

During isotonic contraction, the heavier the load, the faster the velocity of contraction

False

8

During isometric contraction, the energy used appears as movement

False

9

What is the role of tropomyosin in skeletal muscles?

A) Tropomyosin serves as a contraction inhibitor by blocking the actin binding sites on the myosin molecules.
B) Tropomyosin is the chemical that activates the myosin heads.
C) Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules.
D)Tropomyosin is the receptor for the motor neuron neurotransmitter.

C) Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules.

10

Fatigued muscle cells that recover rapidly are the products of ________.

intense exercise of short duration

11

excitation-contraction coupling requires which of the following substances

Ca2+ and ATP

12

what structure in skeletal muscle cells functions in calcium storage?

sacroplasmic reticulum

13

Articular (hyaline) cartilage

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C

14

Fibrous capsule

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D

15

Ligament

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A

16

Joint cavity (contains synovial fluid)

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B

17

Synovial Membrane

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E

18

Label the types of movements allowed by synovial joints

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A=flexion

B=extension

C=Hyperextension

19

Label the types of movement allowed by synovial joints

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A=abduction

B=adduction

C=circumduction

D=rotation

20

Label the types of synovial joints

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A=plane joint

B=hinge joint

C=pivot joint

D=condylar joint

E=saddle joint

F=ball-and-socket joint

21

abduction and adduction always refer to movements of the appendicular skeleton

True

22

a twisting motion of the foot that turns the sole inward is called eversion

False (inversion)

23

amphiarthroses are joints typically found at the end of long bones

False

24

only rotation is possible in pivot joints

True

25

a suture is an example of synarthroses

True

26

which of the following is NOT a function of synovial fluid

a. lubrication

b. protects articular cartilages

c. increases osmotic pressure within joint

d. shock absorption

c. increases osmotic pressure within joint

27

the epiphyseal growth plate is an example of a(n)

a. amphiarthrosis

b. symphysis

c. gomphosis

d. synchondrosis

d. synchondrosis