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A part of the body formed of two or more tissues and adapted to carry out a specific function; e.g., the stomach.
Frontal (coronal) section
Longitudinal (vertical) plane that divides the body into anterior and posterior parts.
A group of similar cells (and their intercellular substance) specialized to perform a specific function; primary ______ types of the body are epithelial, connective, muscle, and nervous tissue.
System consisting of lymphatic vessels, lymph nodes, and other lymphoid organs and tissues; drains excess tissue fluid from the extracellular space and provides a site for immune surveillance.
Transverse (horizontal) Section
A plane running from right to left, dividing the body into superior and inferior parts.
A group of organs that work together to perform a vital body function; e.g., the nervous system.
The organ system consisting of the skeletal muscles of the body and their connective tissue attachments.
System primarily responsible for water electrolyte, and acid-base balance and removal of nitrogenous wastes.
Negative Feedback Mechanisms
The most common of homeostatic control mechanisms. The net effect is that the output of the system shuts off the original stimulus or reduces its intensity.
The living animal (or plant), which represents the sum total of all its organ systems working together to maintain life.
(1) A cell or nerve ending of a sensory neuron specialized to respond to particular types of stimuli. (2) Molecule that binds specifically with other molecules e.g., neurotransmitters, hormones, antigens.
Positive Feedback Mechanisms
Feedback that tends to cause the level of a variable to change in the same direction as an initial change.
The structural and functional unit of living organims; contains a nucleus and a variety of organelles enclosed by a limiting membrane.
Organ specialized to secrete or excrete substances for further use in the body or for elimination.
A longitudinal (vertical) plane that divides the body or any of its parts into right and left portions.
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