Smooth muscle
Involuntary non-striated muscle, so-called because it has no sarcomeres and therefore no striations .
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Muscle contraction
Activation of tension-generating sites within muscle cells.
Activation of tension-generating sites within muscle cells.
Unlike skeletal muscle, the contractions of smooth and cardiac muscles are myogenic (meaning that they are initiated by the smooth or heart muscle cells themselves instead of being stimulated by an outside event such as nerve stimulation), although they can be modulated by stimuli from the autonomic nervous system.
Muscle cell
A muscle cell is also known as a myocyte when referring to either a cardiac muscle cell (cardiomyocyte), or a smooth muscle cell as these are both small cells.
Iris (anatomy)
Thin, annular structure in the eye, responsible for controlling the diameter and size of the pupil, thus the amount of light reaching the retina.
Thin, annular structure in the eye, responsible for controlling the diameter and size of the pupil, thus the amount of light reaching the retina.
The muscle cells of the iris are smooth muscle in mammals and amphibians, but are striated muscle in reptiles (including birds).
Cardiac muscle
Cardiac muscle (also called heart muscle or myocardium) is one of three types of vertebrate muscle tissue, with the other two being skeletal muscle and smooth muscle.
Urinary bladder
Hollow organ in humans and other vertebrates that stores urine from the kidneys before disposal by urination.
Hollow organ in humans and other vertebrates that stores urine from the kidneys before disposal by urination.
The trigone is an area of smooth muscle that forms the floor of the bladder above the urethra.
Gastrointestinal tract
Tract or passageway of the digestive system that leads from the mouth to the anus.
Tract or passageway of the digestive system that leads from the mouth to the anus.
It is considerably shorter in the living body because the intestines, which are tubes of smooth muscle tissue, maintain constant muscle tone in a halfway-tense state but can relax in spots to allow for local distention and peristalsis.
Skeletal muscle
Skeletal muscles (commonly referred to as muscles) are organs of the vertebrate muscular system that are mostly attached by tendons to bones of the skeleton.
Skeletal muscles (commonly referred to as muscles) are organs of the vertebrate muscular system that are mostly attached by tendons to bones of the skeleton.
The other types of muscle are cardiac muscle which is also striated and smooth muscle which is non-striated; both of these types of muscle tissue are classified as involuntary, or, under the control of the autonomic nervous system.
Myosin
Myosins are a superfamily of motor proteins best known for their roles in muscle contraction and in a wide range of other motility processes in eukaryotes.
Myosins are a superfamily of motor proteins best known for their roles in muscle contraction and in a wide range of other motility processes in eukaryotes.
The term has been extended to include a group of similar ATPases found in the cells of both striated muscle tissue and smooth muscle tissue.
Uterus
For other uses of "Womb", see Womb (disambiguation).
For other uses of "Womb", see Womb (disambiguation).
The myometrium of the uterus mostly consists of smooth muscle.
Ciliary muscle
The ciliary muscle is an intrinsic muscle of the eye formed as a ring of smooth muscle in the eye's middle layer, uvea (vascular layer).