The macula has the highest concentration of cones in the eye. Most of the detailed vision comes through the work of the macula.Know More
The eye gives vision to the body and is a combination of nerves, cells and fluids. The optic nerve is the eye's largest sensory nerve and it carries electrical impulses to the eye. The choroid is the largest blood vessel responsible for carrying blood to the retina.
The following parts of the eye are visible when looking at it:
The eye uses the cornea to refract light and it accounts for most of the eye's ability to focus. The lens provides the remaining focusing power as it directs light to the retina, which is the layer of light-sensitive cells at the back of the eye. The retina is responsible for converting light into electrochemical signals that go to the brain. The retina contains receptor cells called rods and cones, which are necessary for night vision, acuity and color perception.
In the center of the retina is a small depression called the fovea centralis, or macula. The macula contains the highest concentration of cones and it is where the eye has the sharpest vision.Learn more about Human Anatomy
The average size of a human eye is 1 inch, roughly 2/3 the size of a ping pong ball, and weighs approximately 1/4 of an ounce. Size in adults varies little and is relatively uniform with an allowance for 2 to 3 millimeters.Full Answer >
Dictionary.com states that "thorax" indicates the part of the torso in humans or in higher vertebrates that is situated between the abdomen and the neck. The thorax, or chest, includes the cavity where the lungs and heart are located. The ribs, sternum and some vertebrae that surround the cavity.Full Answer >
The esophagus is part of the gastrointestinal system. It is a tube that connects the mouth to the stomach and is between 9 and 10 inches long. When it is relaxed, it is only about an inch wide.Full Answer >
Secretory vesicles store proteins and small molecules until they are signaled to release them as part of the regulated secretory pathway. While some fuse with the cell's plasma membrane, others do not.Full Answer >