QuestionSBA
QuestionChoice
Summation is a phenomenon that occurs when motor unit action potentials fire so quickly that they are not able to relax in between action potentials.
10001933
b
Summation
QuestionChoice
Rate coding is one of the two mechanisms the brain uses to control muscle force.

There are three different types of motor units - slow, fast fatiguable and fast fatigue resistant. A motor unit is capable of firing at a range of different speeds. In rate coding, slower units fire at a lower frequency and produce less force. Faster units fire at a faster frequency, producing more force.
10001932
a
Rate coding
QuestionChoice
The recruitment principle of motor unit regulation means that smaller units are recruited first, followed by larger units if more force is required. This allows for better control of muscles.
10001934
c
Recruitment
QuestionChoice
Isometric muscle contraction occurs when the muscle is contracted, but there is no movement of the muscle - no shortening or lengthening. For example, if you held a weight out in front of you and did not move.
10001936
e
Isometric
QuestionChoice
Concentric muscle contraction is a muscle contraction where the muscles shorten, such as doing a bicep curl.
10001935
d
Concentric
Concept
Chapter
2693
3990
Regulation of muscle force
Topic
145
Orthopaedics
12933
The brain can regulate the force a single muscle can produce in a mechanism where, as the firing rate of a motor unit increases, the force produced by the motor unit also increases.

Which mechanism of muscle regulation is this describing?
a