Muscles - True/False Question Answers

Answers:
1. T
2. F
3. F
4. F
5. T
6. F
7. F
8. F
9. T
10. F

Muscle Questions - #2

Answers:
1) Skeletal muscle is described by all of the following EXCEPT:
d) autorhythmic

2) The walls of hollow organs and some blood vessels contain this muscle tissue:
d) smooth

3) Which of the following is unique to cardiac muscle tissue:

c) has intercalated discs

4) Approximately what percentage of body heat is generated by muscle tissue:
d) 85%

5) A muscle fascicle is a:
c) bundle of muscle fibers

6) The smallest contractile unit of skeletal muscle is a:
a) sarcomere

7) The major regulatory proteins in muscle tissue are:
d) troponin and tropomyosin

8) Which of the following actions is caused by skeletal muscle:
d) eye movements

9) Which of the following does NOT occur in a muscle during contraction:
b) muscle fibers stretch

10) This process aids in skeletal muscle relaxation after contraction:
c) acetylcholinesterease degrades acetylcholine

11) The stiffness of muscle tissue in rigor mortis partially results from:
b) excessive calcium release in muscle

12) A single motor neuron may innervate as few as 3-5 fibers in muscles of the:
c) eye

13) When an action potential reaches the presynaptic terminal of the motor neuron:
b) acetylcholine is released into the synaptic cleft

14) Lack of acetylcholinesterase in the synaptic cleft would result in:
c) excessive, continuous stimulation of the muscle fiber


15) Curare, a toxin, blocks the acetylcholine receptors on muscle tissue. This would result in:
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

17) Muscular dystrophy is a congenital disorder characterized by
a) skeletal muscle degeneration

18) Which of the following disorders is characterized by painful musculoskeletal "tender points":
a) fibromyalgia

19) Anabolic steroids have all these effects except:
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

Answers - Muscle Questions - #1

1. State of a muscle at rest.
2. Muscle cell and controlling neuron
3. Muscle cells are recruited in sequence rather than simultaneously.
4. Cytoplasm is flooded with Ca++ ions
5. False - sarcomere
6. Z-line
7. False - Muscle cell movement creates heat by friction.
8. Long - longus
Lateral - lateralis
diagonal - oblique
triangular - deltoid
saw-toothed - serrated
diamond - pyramidis
circular - orbicularis
wide - lattisimus

9. Insertion
10. rhomboidus thoracicus
11. origin
12. False
13. False - heredity
14. True
15. False - isometric
16. False - remember the "all-or-nothing" principle
17. 300
18. True
19. muscle cell and nerve cell
20. True (poplitius locks and unlocks the knee)

Remember the organizational order (smallest to largest) for muscles:
sarcomere --> myofibril--->muscle fiber--> muscle fascicle-->skeletal muscle

Muscle Questions - Set #3

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

True/False Questions - Muscles

1. The troponin and tropomyosin system is bound to actin molecules.
2. The troponin and tropomyosin system has calcium ions attached to it.
3. Acetyl Choline (ACh) molecules are located in the receptors on the motor end plate.
4. The myosin cross bridges come in contact with the actin molecules.
5. Calcium is in high concentration in the SR - and low concentration inside the muscle cell.
6. The troponin and tropomyosin system is bound to the motor end plate.
7. Acetyl Choline ester-ase (AChE) is secreted by the motor neuron.
8. Protein molecules inside a sarcomere , such as actin and myosin, are longer when a muscle cell is relaxed, as compared to when it is contracted.
9. The motor neuron does NOT secrete any NTS in order to activate relaxation.
10. There are NTSs in the receptors on the motor end plate.

Web link to answers: http://www.msjensen.gen.umn.edu/webanatomy/wa_muscle/wa_muscle_relax_1.htm#there%20are%20any