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Flashcards in Anatomy 3 Deck (60)
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1

Skeletal muscle is described by all of the following EXCEPT:
a) striated
b) voluntary
c) multinucleate
d) autorhythmic

d) autorhythmic

2

The walls of hollow organs and some blood vessels contain this muscle tissue:
a) striated
b) skeletal
c) cardiac
d) smooth

d) smooth

3

Which of the following is unique to cardiac muscle tissue:
a) is involuntary
b) is non-striated
c) has intercalated discs
d) contains smooth muscle tissue

c) has intercalated discs

4

Approximately what percentage of body heat is generated by muscle tissue:
a) 15%
b) 30%
c) 55%
d) 85%
e) 98%

d) 85%

5

A muscle fascicle is a:
a) bundle of myofibrils
b) bundle of connective tissue
c) bundle of muscle fibers
d) muscle cell

c) bundle of muscle fibers

6

The smallest contractile unit of skeletal muscle is a:
a) sarcomere
b) motor unit
c) synapse
d) thin filament

a) sarcomere

7

The major regulatory proteins in muscle tissue are:
a) myosin and tropomyosin
b) myosin and actin
c) actin and troponin
d) troponin and tropomyosin

d) troponin and tropomyosin

8

Which of the following actions is caused by skeletal muscle:
a) constriction of blood vessels
b) heartbeat
c) dilation of pupil
d) eye movements

d) eye movements

9

Which of the following does NOT occur in a muscle during contraction:
a) thick and thin filaments bind to each other
b) muscle fibers stretch
c) thick and thin filaments "slide" past each other
d) muscle fibers shorten

b) muscle fibers stretch

10

This process aids in skeletal muscle relaxation after contraction:
a) calcium is released from intracellular storage sites
b) motor neurons send electrical signal to muscle
c) acetylcholinesterease degrades acetylcholine
d) troponin binds calcium

c) acetylcholinesterease degrades acetylcholine

11

The stiffness of muscle tissue in rigor mortis partially results from:
a) excessive acetycholine activity on muscle
b) excessive calcium release in muscle
c) excessive lactic acid build up
d) excessive contraction of the fibers

b) excessive calcium release in muscle

12

A single motor neuron may innervate as few as 3-5 fibers in muscles of the:
a) upper arms
b) legs
c) eye
d) heart

c) eye

13

) When an action potential reaches the presynaptic terminal of the motor neuron:
a) calcium is released inside of the muscle fiber
b) acetylcholine is released into the synaptic cleft
c) acetylcholinesterease is released into the synaptic cleft
d) physical contact between the motor neuron and the muscle fiber occurs

b) acetylcholine is released into the synaptic cleft

14

) Lack of acetylcholinesterase in the synaptic cleft would result in:
a) decrease acetylcholine production by the motor neuron
b) relaxation of the muscle fiber
c) excessive, continuous stimulation of the muscle fiber
d) inability of the motor neuron to stimulate the muscle fiber

c) excessive, continuous stimulation of the muscle fiber

15

Curare, a toxin, blocks the acetylcholine receptors on muscle tissue. This would result in:
a) increased stimulation of the muscle fiber
b) inability of the muscle to respond to motor nerve stimulus
c) contraction of the muscle fiber
d) excessive contractions and convulsions

b) inability of the muscle to respond to motor nerve stimulus

16

Training excersizes such as jogging, swimming and aerobics have this effect on skeletal muscle tissue:
a) increase number of mitochondria per muscle fiber
b) increase number of muscle fibers
c) increase number of motor units
d) increase number of skeletal muscles

a) increase number of mitochondria per muscle fiber

17

Muscular dystrophy is a congenital disorder characterized by
a) skeletal muscle degeneration
b) excessive convulsions
c) shaking and trembling
d) only cardiac damage

a) skeletal muscle degeneration

18

Which of the following disorders is characterized by painful musculoskeletal "tender points":
a) fibromyalgia
b) myasthenia gravis
c) Duchenne muscular dystrophy
d) Becker muscular dystrophy

a) fibromyalgia

19

) Anabolic steroids have all these effects except:
a) builds muscle proteins
b) increases muscle strength
c) increases number of muscles in the body
d) can result in liver cancer and heart disease

c) increases number of muscles in the body

20

Which of the following statements regarding aging and the muscular system is true:
a) aging is associated with decreased myoglobin production
b) the effects of aging can be nearly completely reversed
c) satellite cells increase in aging causing fibrosis
d) young persons have more adipose in muscles compared to elderly persons

a) aging is associated with decreased myoglobin production

21

Which of the following can be found in cartilage but not bone tissue:
a. lacunae
b. protein fibers
c. blood vessels
d. chondroitin

d. chondroitin

22

The most common type of exocrine gland is this type:
a. apocrine
b. merocrine
c. endocrine
d. holocrine

b. merocrine

23

Epithelia that consist of more than one layer of cells is termed:
a. striated
b. stratified
c. stipilated
d. intercalated

b. stratified

24

The matrix of connective tissue is composed of:
a. cells, fibers and ground substance
b. cells and fibers
c. fibers and ground substance
d. cells and ground substance

c. fibers and ground substance

25

Small hair-like structures on the surface of some epithelial cells are termed:
a. cilia
b. glia
c. villi
d. microvilli

a. cilia

26

These cells are located in bone tissue:
a. chondroblasts
b. osteocytes
c. fibroblasts
d. chondrocytes

b. osteocytes

27

Which of the following heals the quickest after injury:
a. bone
b. epithelium
c. cartilage
d. muscle

b. epithelium

28

The small holes in which some connective tissue cells reside are termed:
a. lumen
b. lamellae
c. lacunae
d. lamaze

c. lacunae

29

Which of the following does not describe skeletal muscle tissue fibers:
a. striated
b. voluntary
c. multinucleate
d. branched

d. branched

30

Which of the following suffixes implies "growth" or "formation":
a. -blast
b. -lemma
c. -stasis
d. -cyte

a. -blast