a group of smooth muscles called sphincter pupillae cause the pupil constriction which is known as mydriasis.
The dilator muscle which makes the pupil larger and the constrictor muscle which makes the pupil smaller.
Sympathetic stimulation of the eye will cause dilation of the pupil (mydriasis) and relaxation of the ciliary muscle for far vision.
for the illegal drugs: the withdrawal of opioids such as morphine is known to cause mydriasis.
dilation of the pupil.
Dilation of the pupils (Mydriasis)
The normal gene is responsible for a muscle protein controlling the flow of calcium during muscle contraction.
The normal gene is responsible for a muscle protein controlling the flow of sodium during muscle contraction.
Piloerector Muscle
bones and brain
The specific structure within a muscle cell that contains the sarcomere I band and is responsible for muscle contraction is called the myofibril.
No, in animals even casuse mydriasis
The muscle responsible for the goosebumps appearance is the arrector pili muscle. When stimulated, this muscle contracts and pulls on hair follicles, causing them to stand upright and creating the appearance of goosebumps on the skin.