Week 7 & 8 Muscles

Question 1

3 types of muscle cells

Answer 1

skeletal, smooth and cardiac

Question 2

The T tubule ranges ____ to the surface of the skeletal muscle cell membrane.

Answer 2

The T tubule ranges TRANSVERSELY to the surface of the skeletal muscle cell membrane.

Question 3

Tropomyosin covers the cross bridge binding sites on the thin filaments when a skeletal muscle sarcomere is not contracting.

Answer 3

Tropomyosin covers the cross bridge binding sites on the thin filaments when a skeletal muscle sarcomere is not contracting.

Question 4

Acetylcholinesterase removes ____ from neuromuscular junction (synaptic cleft)

Answer 4

Acetylcholinesterase removes ACh from neuromuscular junction (synaptic cleft)

Question 5

The M line is formed by a proteins that hold ____ filaments together at the centre of sarcomere

Answer 5

The M line is formed by a proteins that hold THICK filaments together at the centre of sarcomere

Question 6

Atrophy can develop in a muscle by either ____ or ____.

Answer 6

Atrophy can develop in a muscle by either DENERVATION or DISUSE

Question 7

Thin and thick filaments overlap (at normal sarcomere length) in the ____.

Answer 7

Thin and thick filaments overlap (at normal sarcomere length) in the A BAND.

Question 8

The _____ of the sarcomere consists of myosin but does not contain actin.

Answer 8

The H zone of the sarcomere consists of myosin but does not contain actin.

Question 9

Anaerobic exercise is _____ type exercise.

Answer 9

Anaerobic exercise is medium range type exercise.

Question 10

____ occurs when a muscle fiber is stimulated so rapidly that it is not allowed to relax between stimulations, resulting in a smooth, sustained contraction

Answer 10

TETANUS occurs when a muscle fiber is stimulated so rapidly that it is not allowed to relax between stimulations, resulting in a smooth, sustained contraction

Question 11

Motor unit is ___

Answer 11

Motor neuron and the muscle fibres it suplies