Smooth muscles are the type of muscle that contracts and relax to control the movement of the contents.
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What are Smooth muscles?
Because it lacks sarcomeres and as a result, striations, smooth muscle is an involuntary non-striated muscle (bands or stripes). Its two subgroups are single-unit smooth muscle and multi-unit smooth muscle. A syncytium is the collective contraction of the sheet or bundle of smooth muscle cells that make up a single-unit muscle.
Smooth muscle makes up the walls of hollow organs including the stomach, intestines, bladder, and uterus as well as the blood and lymphatic vessels, as well as the tracts of the respiratory, urinary, and reproductive systems. The ciliary muscle, a type of smooth muscle present in the eyes, changes the shape of the lens by dilation and contraction of the iris.
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Answer:
Scientists believe the counterclockwise rotation of the planets is caused by the way they formed in the debris field. Each planet may tilt at an angle from the direct north/south pole, causing seasons to occur. The planetary tilting does not change the basic nature of the planet rotation.
Explanation:
Nsegmented soft body with bilateral symmetry. Presence of an internal or external shell. A toothed tongue (made mostly of chitin) called the radula. A mantle which is a fold in the body wall that lines the shell.
Answer:It is convenient to consider the structures of the body in terms of fundamental levels of organization that increase in complexity: subatomic particles, atoms, molecules, organelles, cells, tissues, organs, organ systems, organisms and biosphere
Explanation:
