* Only one word answer in each blank. 1) Contraction of a muscle most often move

Question

* Only one word answer in each blank. 1) Contraction of a muscle most often moves the ____ towards the ____. 2) An ________ can be described as a broad tendinous sheet. 3) Stem cells located between the endomysium and sarcolemma that function in the repair of damaged muscle tissue are called _____ _____. 4) Calcium binds to what part of the thin filament? (Be as specific as possible.) ______ - ______. 5) The complex of a transverse tubule and two adjacent terminal cisternae is known as a ________.

Explanation / Answer

1. the origin of the muscle is situated where the bone is fixed and the insertion of muscle is situated where the bone is movable.

muscle contraction is of two types -

so the answer is "contraction of the muscle most often moves insertion towards origin

2. muscles consists of a fleshy part called belly and fibrous part called tendon when cord like and aponeurosis when flattened and sheet like.

aponeurosis is-

# fibrous

# noncontractile

# inelastic

So the answer is aponeurosis is a broad tendinous sheet.

eg palmar aponeurosis

3. myosatellite cells or satellite cells undergo cell cycle to form skeletal muscle or on maturation of satellite cells, skeletal muscle is formed. they are situated in the basement membrane and the sarcolemma. during muscle injury the quiscent satellite cell participate in the cell cycle and help in regeneration of muscle fibres

so the answer is satelite or myosatellite cells

4. the head of myosin molecules has a tendency to attach with active site of F actin.
In relaxed condition, the active site of F actin
is covered by the tropomyosin. Therefore, the myosin
head cannot combine with actin molecule.
Large number of calcium ions, released
during the muscle excitation, bind
with troponin C.
This pulls tropomyosin molecule away from
F actin making the active
site of F actin uncovered and exposed. Immediately
the head of myosin gets attached to the actin.

so the answer is tropo-myosin

5. Triad = it is formed by transverse tubules or t tubules with the SR which is known as the terminal cisternae.

triad is present at the sarcomere

triad plays an important part in excitation contraction coupling leading to muscle contraction

so the answer is triad

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