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Human A&P Exam 3

front 1

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.

back 1

1) B

2) D

3) A

4) E

5) C

front 2

Using Figure 9.2, match the following:

6) I band.

7) H zone.

8) A band.

9) Z disc.

10) M line

back 2

6) C

7) B

8) D

9) A

10) E

front 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.

back 3

11) A

12) B

13) A

14) B

15) A

16) A

front 4

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

back 4

False

front 5

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

back 5

True

front 6

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

back 6

True

front 7

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

back 7

False

front 8

During isometric contraction, the energy used appears as movement

back 8

False

front 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.

back 9

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

front 10

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

back 10

intense exercise of short duration

front 11

excitation-contraction coupling requires which of the following substances

back 11

Ca2+ and ATP

front 12

what structure in skeletal muscle cells functions in calcium storage?

back 12

sacroplasmic reticulum

front 13

Articular (hyaline) cartilage

back 13

C

front 14

Fibrous capsule

back 14

D

front 15

Ligament

back 15

A

front 16

Joint cavity (contains synovial fluid)

back 16

B

front 17

Synovial Membrane

back 17

E

front 18

Label the types of movements allowed by synovial joints

back 18

A=flexion

B=extension

C=Hyperextension

front 19

Label the types of movement allowed by synovial joints

back 19

A=abduction

B=adduction

C=circumduction

D=rotation

front 20

Label the types of synovial joints

back 20

A=plane joint

B=hinge joint

C=pivot joint

D=condylar joint

E=saddle joint

F=ball-and-socket joint

front 21

abduction and adduction always refer to movements of the appendicular skeleton

back 21

True

front 22

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

back 22

False (inversion)

front 23

amphiarthroses are joints typically found at the end of long bones

back 23

False

front 24

only rotation is possible in pivot joints

back 24

True

front 25

a suture is an example of synarthroses

back 25

True

front 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

back 26

c. increases osmotic pressure within joint

front 27

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

a. amphiarthrosis

b. symphysis

c. gomphosis

d. synchondrosis

back 27

d. synchondrosis