The correct answer is postural muscles.
Postural muscles are muscles with the function to sustain posture in the gravity field. In response to stimuli such as over-use, under-use or trauma, postural muscles tend to shorten. This type of muscles is sometimes called tonic muscles because they have high resting tonus.
The answer is B, matrix of the mitochondria
Isotonic solution.
Since it has the same salt concentration as the cell the solution is neither hypotonic or hypertonic.
