| Actin | Myosin |
| Actin is a thin contractile protein | Myosin is a thick contractile protein. |
| It is present in the light bands and is called an I-band or isotropic band. |
It is present in the dark bands and is called an A-band or anisotropic band. |
| It has a smooth surface. | It has a rough surface |
| It does not form cross-bridges. | It forms cross-bridges. |
| It consists of troponin and tropomyosin. | It consists of meromyosin (myosin monomer). |
Answered by Pragya Singh | 1 year ago
Fill in the blank spaces:
(a) All mammals (except a few) have __________ cervical vertebra.
(b) The number of phalanges in each limb of human is __________
(c) Thin filament of myofibril contains 2 ‘F’ actins and two other proteins namely____ and _____.
(d) In a muscle fibre \( (Ca^{2+} )\) is stored in __________
(e) __________ and __________ pairs of ribs are called floating ribs.
(f) The human cranium is made of __________ bones
Name the type of joint between the following:-
(a) atlas/axis
(b) carpal/metacarpal of thumb
(c) Between phalanges
(d) femur/acetabulum
(e) Between cranial bones
(f) Between pubic bones in the pelvic girdle
How do you distinguish between a skeletal muscle and a cardiac muscle?
What are the different types of movements exhibited by the cells of the human body?
Match Column I with Column II:
| Column I | Column II |
| (a) Smooth Muscle | (i) Myoglobin |
| (b) Tropomyosin | (ii) Thin Filament |
| (c) Red muscle | (iii) Sutures |
| (d) Skull | (iv) Involuntary |