Specialized cells - cells designed to do specific tasks
Epithelial tissues - tissue that covers the surface of the body and lines internal organs
Muscle tissue - tissue that controls the internal movement of materials in the body, as well as external movement of the entire body or body parts.
Homeostasis - process by which organisms maintain a relatively stable internal environment
Sensory receptors - neuron that reacts directly to light, sound or other stimuli by sending impulses to to other neurons and eventually to the central nervous system
Rods - photo-receptor in eye that is extremely sensitive to light
Cones - in gymnosperms, a seed-bearing structure in the retina of the eyes, a photo-receptor that responds to light of different colors, producing color vision
Pupil - small opening in the middle of the iris through which light enters the eye
Connective tissues - tissue that holds organs in place and binds different parts of the body together.
Nervous tissue - tissue that receives messages from the body's external and internal environment, analyzes the data and directs the response.
Feedback Inhibition - process by which cells release energy in the absence of oxygen
Neuron - cell that carries messages throughout the nervous system
Lens - transparent object behind the iris that changes shape to help adjust the eye's focus to see near or distant objects
Retina - innermost layer of the eye
Cochlea - fluid filled part of the inner eye, sends nerve impulses to the brain through the cochlear nerve
Semicircular canals - one of the three structures within the inner ear that help an organism maintain balance.
Taste buds - sense organs that detect the flavor of a substance
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