NM - 8 Muscle mechanics

Question 1

What is tetanus

Answer 1

A single action potential from a motor neurone will produce a single contraction in the muscle fibres innervated by the motor neuron . Isolated contraction is called a twitch

Question 2

Explain summation

Answer 2

Muscles can be activated to contact many times even before it has time to relax

• At high frequencies of activation there is a build up of tension called summation

Complete tetanus - reaches maximum level of tension

Question 3

Types of visceral smooth muscle

Answer 3

ntestine
* Uterus
* Bladder
* Ureters
* Ducts of exocrine glands
* Precapillary sphincters
* Small blood vessels e.g. arterioles

Question 4

Types of multiunit smooth muscle

Answer 4

Cilliary muscle
* Iris
* Piloerector muscles
* Large arteries and veins
* Arteriovenous shunt vessels
* Bronchial smooth muscle