Q1
The functional unit of contractile system in striated muscle is
Correct Answer
Option B
Solution
(b) Sarcomere is the basic functional unit of muscle, bounded by Z-lines.
Locomotion and Movement
Q2
The lower jaw in mammals is made up of
Correct Answer
Option A
Solution
(a) Lower jaw is made of the mandible — the largest bone in the human skull.
Q3
Total number of bones in the hind limb of man is
Correct Answer
Option B
Solution
(b) Each hind limb: 1 femur + 1 patella + 1 tibia + 1 fibula + 7 tarsals + 5 metatarsals + 14 phalanges = 30.
Q4
Which one of the following is a skull bone?
Correct Answer
Option D
Solution
(d) Pterygoid process is a small bone articulated with palatine — a skull bone.
Q5
Which of the following is the contractile protein of a muscle?
Correct Answer
Option A
Solution
(a) Myosin is the primary motor/contractile protein in muscle.
Q6
Glenoid cavity articulates: movement? system:
Correct Answer
Option C
Solution
(c) Glenoid cavity articulates humerus with scapula.
The end of the scapula, called the glenoid, meets the head of the humerus to form a glenohumeral cavity that acts as a flexible ball-and-socket joint.
The joint is stabilized by a ring of fibrous cartilage surrounding the glenoid, called the labrum.
Q7
Out of ' ' pairs of ribs in humans only ' ' pairs are true ribs. Select the option that correctly represents values of and and provides their explanation:
Correct Answer
Option D
Solution
(d) In human, 12 pairs of ribs are present out of which 7 pairs of ribs (1st to 7 th pair) are dorsally attached to vertebral column and ventrally to the sternum.
Q8
The pivot joint between atlas and axis is a type of :
Correct Answer
Option B
Solution
(b) Pivot joint is a type of synovial joint which provide freely movement between atlas and axis vertebrae of vertebral column.
The pivot joints (and the other joints) can be affected by such conditions as the following: Ankylosis: The fusion of bones across a joint.
It is often a complication of arthritis.
Ankylosing spondylitis: A type of inflammatory arthritis that progresses to ankylosis.
Q9
Calcium is important in skeletal muscle contraction because it
Correct Answer
Option A
Solution
(a) The sarcoplasmic reticulum to release calcium ions into the muscle interior where they bind to troponin, thus causing tropomyosin to shift from the face of the actin filament to which myosin heads need to bind to produce contraction.
Q10
Haversian canals occur in
Correct Answer
Option A
Solution
(a) Haversian canals are a characteristic feature of the mammalian bones present in the matrix of bones.
They are present in the humerus bone.
Haversian canals are microscopic tubes or tunnels in cortical bone that house nerve fibers and a few capillaries.
This allows bone to get oxygen and nutrition without being highly vascular.
These canals also communicate with bone cells using special connections, or canaliculi.
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