HBS 2.3.2 & 2.4.2
Terms in this set (24)
A gland (as a thyroid or pituitary) that produces an endocrine secretion
Also called ductless gland or gland of internal secretion
The glands and parts of glands that produce endocrine secretions, help to control metabolic activities & include the thyroid, pituitary, parathyroid, adrenals, islets of Langerhans, ovaries and testes.
A gland (as a sweat gland, a salivary gland, or a kidney) that releases a secretion external to roar the surface of an organ by a duct or canal.
A cell, or group of cells or organ of endothelial origin that removes materials from the blood, concentrates or alters them, and secretes them for use in the body or elimination from the body.
A protein hormone that is produced especially by the pancreatic islets of Langerhans and that promotes an increase in the sugar content of the blood by increasing the rate of breakdown of glycogen in the liver.
Any one of the many circulating chemical signals found in all multicellular organisms that are formed in specialized cells, travel in body fluids, and coordinate the various parts of the organism by interacting with target cells.
The ventral part of the vertebrate forebrain; functions in maintaining homeostasis, especially in coordinating the endocrine and nervous systems; secretes hormones of the posterior pituitary and releasing factors, which regulate the anterior pituitary.
A vertebrate hormone that lowers blood glucose levels by promoting the uptake of glucose by most body cells and the synthesis and storage of glycogen in the liver.
An endocrine gland at the base of the hypothalamus; consists of a posterior lobe, which stores and releases two hormones produced by the hypothalamus, and an anterior lobe, which produces and secretes many hormones that regulate diverse body functions.
A defect of an optical system (as a lens) causing rays from a point to fail to meet in a focal point resulting in a blurred and imperfect image.
The automatic adjustment of the eye for seeing at different distances affected by changes in the convexity of the lens.
The small circular area in the retina where the optic nerve enters the eye that is devoid of rods and cones and is insensitive to light.
Any of the conical photosensitive receptor cells that function in color vision.
The transparent part of the coat of the eyeball that covers the iris and pupil and admits light to the interior.
The ability to judge the distance of objects and the spatial relationship of objects at different distances.
A condition in which visual images come to a focus behind the retina of the eye and vision is better for distant than for near objects
The opaque muscular contractile diaphragm that is suspended in the aqueous humor in front of the lens of the eye,
determines the color of the eyes.
A curved piece of glass or plastic used singly or combined in eyeglasses or an optical instrument (as a microscope) for forming an image by focusing rays of light.
A condition in which the visual images come to a focus in front of the retina of the eye because of defects in the refractive media of the eye or of abnormal length of the eyeball resulting especially in defective vision of distant objects
Either of the pair of sensory nerves that comprise the second pair of cranial nerves, arise from the ventral part of the diencephalon, form an optic chiasma before passing to the eye and spreading over the anterior surface of the retina, and conduct visual stimuli to the brain.
The opening in the iris, which admits light into the interior of the vertebrate eye; muscles in the iris regulate its size.
The deflection from a straight path undergone by a light ray or a wave of energy in passing obliquely from one medium (as air) into another (as water or glass) in which its velocity is different.
The sensory membrane that lines most of the large posterior chamber of the vertebrate eye, is composed of several layers including one containing the rods and cones, and functions as the immediate instrument of vision by receiving the image formed by the lens and converting it into chemical and nervous signals which reach the brain by way of the optic nerve.
Any of the long rod-shaped photosensitive receptors in the retina responsive to faint light.