Essays

Question 0

Muscle contraction

Answer 0

1. Action potential travels down motor neuron and releases acetylcholine at neuromuscular synapse.
2. ACh binds to motor end plate on sarcolemma and sends signal down t-tubule to cell’s center
3. calcium ions are released by sarcoplasmic reticulum and bind to actin.
4. ATP on myosin heads split; cross-bridge is formed binding myosin heads to actin.
5. ATP is released ; sarcomere shortens and muscle contracts

Question 1

Rigor mortis

Answer 1

When skeletal muscles run out of ATP and sarcoplasmic reticulum is unable to remove calcium ions from sarcoplasm. Without ATP, the cross bridges cannot detach from active sites, muscle then locks in contracted position.m

Question 2

Properties of skeletal muscle

Answer 2

1. Excitability
2. Contractibility
3. Extensibility
4. Elasticity

Question 3

Aging in skeletal muscle

Answer 3

1. Decrease in diameter
2. Decrease in elasticity
3. Decrease tolerance
4. Muscle fatigue occurs quicker
5. Increase in recovery

Question 4

Carpal tunnel

Answer 4

Median nerve that travels through flexor retinaculum gets inflamed and there is no room to relieve pressure

Question 5

Shoulder stabilization muscles; anterior dislocation

Answer 5

Supraspinatus
Infraspinatus
Subscapularis
Teres minor

Head of humerus is displaced anteriorly from glenoid cavity