SmooTh muscle
The size of the primary bronchioles are from 0.3-1.0 mm then go further to the terminal bronchioles which are smaller in size which connect to the alveoli.
Smooth muscle in the bronchioles helps to regulate and control the diameter of the airways. Contraction of this muscle narrows the bronchioles, while relaxation widens them, allowing for control of air flow in and out of the lungs.
iris
The Iris.
pectorals
The heart you idiot!
The color ring of muscle that controls the size of the pupil is called the iris. It can expand or contract to regulate the amount of light entering the eye.
The heart you idiot!
Yes it is.
Eye trauma can damage the muscle that controls pupil size.
The size of the pupil in the human eye is controlled by the iris, which is a ring of muscle that can expand or contract to adjust the size of the pupil.
The diaphragm is the main muscle responsible for breathing. When it contracts, it enlarges the chest cavity and creates a vacuum that allows the lungs to expand and take in air. When it relaxes, the chest cavity decreases in size, forcing air out of the lungs.