Lab 19

Question 1

Korotkoff sounds are caused by

Answer 1

NOT laminar versus pulsatile flow as previously thought but rather the movement of the pulse wave in the artery creating sounds from surrounding tissue

Question 2

The (M/I) band is intersected by Z lines

Answer 2

I

Question 3

Isometric vs. Isotonic

Answer 3

Isometric means length isnt changing, isotonic means length changes

Question 4

Motor unit

Answer 4

motor neuron plus group of muscle fibers it innervates, number of fibers determines control (less muscles = finer motor skills)

Question 5

Space between motor neuron and muscle fiber

Answer 5

neuromuscular junction

Question 6

Neurotransmitter for muscle function is

Answer 6

Neurotransmitter, which activates muscle contraction by binding to nicotinic acetylcholine receptors allowing cation channels to open depolarizing muscle and releasing calcium from sarcoplasmic reticulum. Signal is terminated by hydrolysis of Ach by acetylcholinesterase

Question 7

Twitches sum to

Answer 7

tetanus

Question 8

RMS

Answer 8

takes the squares of all amplitudes added up, square root, divided by N

Question 9

How to calibrate

Answer 9

max grip strength first, then everything is standardized to relative effort!