The globular head of the myosin filament has active site/s for binding to:
I. ATP
II. the binding site for actin filament
III. Calcium
1. Only I
2. Only I and II
3. Only II and III
4. I, II, and III
Scapula is a large triangular flat bone situated in the dorsal part of the thorax between:
1. the second and fifth ribs
2. the second and seventh ribs
3. the third and sixth ribs
4. the third and eighth ribs
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
The vasomotor center that controls the diameter of blood vessels is located in the
1. medulla oblongata
2. pons
3. cerebrum
4. cerebellum
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
The neurotransmitter released by the nerve cell at the neuromuscular junction is:
1. Acetylcholine
2. Adrenaline
3. Serotonin
4. Dopamine
Which of the following joints would allow no movement?
(1) Fibrous joint
(2) Cartilaginous joint
(3) Synovial joint
(4) Ball and socket joint
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.
(1) X = 12, Y = 7 True ribs are attached, dorsally to
vertebral column and ventrally to
the sternum.
(2) X = 12, Y = 5 True ribs are attached dorsally to
vertebral column and sternum on
the two ends.
(3) X = 24, Y = 7 True ribs are dorsally attached to
vertebral column, but are free on
ventral side.
(4) X = 24, Y = 12 True ribs are dorsally attached to
vertebral column, but are free on
ventral side.
The pivot joint between atlas and axis is a type of
(1) fibrous joint
(2) cartilaginous joint
(3) synovial joint
(4) saddle joint
Name the ion responsible for unmasking of active sites for myosin for cross-bridge activity during muscle contraction.
(1) Calcium
(2) Magnesium
(3) Sodium
(4) Potassium.