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Eyeball
...  light enters the pupil, the iris functions the same way like the iris diaphragm in the microscope. It regulates the amount of light entering the eyes. It accomplishes the task with the aid of the smooth muscles sphincter pupillae and the dilator pupillae. Retina The retina is part of the nervous tunic. It contains the sensory receptors housing the millions of photoreceptors, the rods and the  ...

Skeletal Muscles
...  human body consists of three types of muscle tissues: the smooth, the cardiac and the skeletal muscles. The smooth muscles make up the muscle tissues in hollow organs in the body, such as the stomach, gastro-intestinal tract and uterus; The cardiac muscle is located in the heart; and lastly, the skeletal muscles are found attached to bones. To understand the skeletal muscles, here is a  ...

Visceral Effector Organs
...  from the person. What are visceral effector organs? These are effector organs influenced by involuntary effector muscles, which can only mobilize when specific nerve impulses are conducted to the smooth muscles. Nerve impulses are important to elicit the appropriate response to that particular stimulus. The effector organ would only respond when neural activity has taken place. The visceral  ...

Smooth Muscle
...  non-striated and have no organized myofilaments. They are designed to contract simultaneously because of their organized muscle layers that are closely interconnected to each other. Functions of the smooth muscles The smooth muscles have several important functions. The most important is the ability to compress, contract or extend ducts, organs, tubes and sacs. As such, smooth muscles are found  ...

Ductus Deferens
...  and it forms part of the male reproductive system of humans as well as some kinds of species. There are a couple of ducts that can be found in it which are all muscular tubes that are surrounded by smooth muscles. It connects to the right and left epididymis and moves sperm by way of the ejaculatory ducts. In humans, each of the tubes is around thirty centimeters in length. The Ductus deferens  ...

Adrenergic Stimulation
...  the body, or inhibit it from performing a certain task/performing in its normal state. The stimulation involves contraction or dilation of some of the muscles in the body (e.g. the heart, and other smooth muscles having surrounded by the most blood vessels including the iris). This is a good example of both an enhancement or inhibitory reaction: When the contraction of the smooth muscles is  ...

Tunics
...  charge of providing segmented contractions and peristaltic contractions to the gastrointestinal tract. This is done because the muscularis is formed by smooth muscle topped with a wise layer of more smooth muscles. These muscles contract, and food then is undulated all over the digestive system. The pulverization of the food gets easier, too, with the help of digestive enzymes. Between the  ...


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