The combination of a neuron and the muscle fiber it associates with is called a/an.

1. fascicle

2. motor end plate

3. motor unit

4. myoneural junction

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The upper ends of the forearm bones articulate with each other in a:

1. pivot joint

2. ellipsoid joint

3. saddle joint

4. hinge joint

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Which of the following is a hinge point?

1. At the base of the first metacarpal

2. Intervertebral disc

3. Interphalageal

4. Between carpal bone

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The neurotransmitter released by the nerve cell at the neuromuscular junction is:

1. Acetylcholine

2. Adrenaline

3. Serotonin

4. Dopamine

 

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Which of the following joints would allow no movement?

(1) Fibrous joint

(2) Cartilaginous joint

(3) Synovial joint

(4) Ball and socket joint

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Out of 'X' pairs of ribs in humans only 'Y' pairs are true ribs. Select the option that correctly represents values of X and Y and provides their explanation.

(a) X = 12, Y = 7           True ribs are attached, dorsally to 

                                      vertebral column and ventrally to

                                      the sternum.

(b) X = 12, Y = 5           True ribs are attached dorsally to

                                      vertebral column and sternum on

                                      the two ends.

(c) X = 24, Y = 7           True ribs are dorsally attached to

                                      vertebral column, but are free on

                                      ventral side.

(d) X = 24, Y = 12         True ribs are dorsally attached to 

                                      vertebral column, but are free on 

                                      ventral side.

 

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The pivot joint between atlas and axis is a type of

(a) fibrous joint                  (b) cartilaginous joint

(c) synovial joint                (d) saddle joint

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Name the ion responsible for unmasking of active sites for myosin for cross-bridge activity during muscle contraction.

(a)  Calcium              (b)  Magnesium

(c)  Sodium              (d)  Potassium.

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Lack of relaxation between successive stimuli in sustained muscle contraction is known as 

(a) fatigue   (b) tetanus    (c) tonus    (d) spasm

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Which of the following is not a function of the skeletal system?

(a) Production of erythrocytes

(b) Storage of minerals

(c) Production of body heat

(d) Locomotion

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