1.2 The Muscular System || QUESTIONS AND ANSWERS 100% SOLVED

1.2 The Muscular System || QUESTIONS AND
ANSWERS 100% SOLVED
1.2.1 Outline the general characteristics common to muscle tissue correct answers •
Contractility
• Extensibility
• Elasticity
• Atrophy
• Hypertrophy
• Controlled by nerve stimuli
• Fed by capillaries

Contractility correct answers o The ability to contract and generate force
o Does so by shortening, quickly bringing on movement

Extensibility correct answers o The ability to be stretched beyond normal resting length when
pulled
o Stretches without being damaged
o Allows quick changes in movement (range)

Elasticity correct answers o The ability to return to the original length after contraction or
extension
o Helps store energy for movement

Atrophy correct answers o When muscle isn't used, number of myofibrils will decrease and it
will 'waste away'/atrophy
o Commonly occurs when people are confined to bed due to:
- Illness
- Injury
- Cannot use limb as it's in a cast

Hypertrophy correct answers o When muscle is trained through increased exercise/activity,
muscle experiences hypertrophy due to increase in myofibrils
o Achieved without cell division

Controlled by nerve stimuli correct answers o Muscles have a good nerve and blood supply
o Nerves that bring impulses from central nervous system to muscle are called 'motor
neurons'
o They release neurotransmitters into blood, stimulating muscle to contract and produce force
o Stimulated by electrical impulses
o Carries info from brain and muscles through the spinal cord

Fed by capillaries correct answers o Rich network of capillaries which provide muscles with:
- Oxygen
- Nutrients
- Calcium
- Remove waste products
o So muscles are good at repairing damage (EG. A muscle is pulled or strained)
o Oxygenated blood travels to the muscle