HUMAN PHYSIOLOGY
LOCOMOTION AND MOVEMENT
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
only globular head
|
|
|
a-globular head+short arm
|
|
|
c-HMM
|
|
|
both b and c
|
Detailed explanation-1: -The myosin II molecule consists of two heavy chains and two pairs of light chains (called the essential and regulatory light chains).
Detailed explanation-2: -Solution : The heavy meromyosin (HMM) component, i.e, the head and short arm projects outwords at regular distance and the angle from each other from the surface of a polymerised myosin filament and is known as cross arm.
Detailed explanation-3: -Figure 1: A cross-bridge forms between actin and the myosin heads triggering contraction. As long as Ca++ ions remain in the sarcoplasm to bind to troponin, and as long as ATP is available, the muscle fiber will continue to shorten.
Detailed explanation-4: -The head with short arm is heavy meromyosin i.e. HMM.