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Adipose Tissue

type of connective tissue whose cells contain fat


the study of the structure of an organism


a type of connective tissue with a fluid matrix called plasma in which red blood cells, white blood cells, and platelets are suspended


a type of connective tissue consisting of living cells held in a rigid matrix of collagen fibers embedded in calcium salts

Cardiac Muscle

a type of striated muscle that forms the contractile wall of the heart


a flexible connective tissue consisting of living cells and collagenous fibers embedded in a rubbery matrix

Circulatory System

the organ system that transports materials such as nutrients and other wastes from body cells

Connective Tissue

animal tissue that functions mainly to bind and support other tissues, having a sparse population of cells scattered through an extracellular matrix, which they produce

Digestive System

the organ system involved in ingestion and digestion of food, absorption of nutrients, and elimination of wastes

Endocrine System

the organ system consisting of ductless glands that secrete hormones and the molecular receptors on or in target cells that respond to the hormones

Epithelial Tissue

a sheet of tightly packed cells lining organs, body cavities and external surfaces, also called epithelium

Fibrous Connective Tissue

a dense tissue with large numbers of collagenous fibers organized into parallel bundles. this is the dominant issue in tendons and ligaments


the steady state of body functioning, a state of equilibrium characterized by a dynamic interplay between outside forces that tend to chance an organism's internal environment and the internal control mechanisms that oppose such changes

Immune System

an animal body's system of defenses against agents that cause disease

Integumentary System

the organ system consisting of the skin and its derivatives, such as hair and nails in mammals

Interstitial Fluid

an aqueous solution that surrounds body cells and through which materials pass back and forth between the blood and the body tissues

Loose Connective Tissue

the most widespread connective tissue in the vertebrate body it binds epithelia to underlying tissues and functions as packing material, holding organs in place

Lymphatic System

the vertebrate organ system through which lymph circulates; includes lymph vessels, lymph nodes and the spleen

Muscle Tissue

tissue consisting of long muscle cells that can contract, either on its own or when stimulated by nerve impulses; the most abundant tisue in a typical animal

Muscular System

the organ system that includes all the skeletal muscles in the body

Negative Feedback

a primary mechanism of homeostasis, whereby a change in a physiological variable triggers a response that counteracts the initial change.

Nervous System

the organ system that forms a communication and coordination network between all parts of an animal's body

Nervous Tissue

tissue made up of neurons and supportive cells


a nerve cell; the fundamental structural and functional unit of the nervous system, specialized for carrying signals from one location in the body to another


a structure consisting of several tissues adapted as a group to perform specific functions

Organ System

a group of organs that work together in performing vital body functions


the study of the functions of an organism's structures

Reproductive System

organ system responsible for reproduction

Respiratory System

functions in exchanging gases with the environment. supplies the blood with O2 and disposes CO2

Skeletal Muscle

type of striated muscle attached to the skeleton; generally responsible for voluntary movements of the body

Skeletal System

provides body support and protects body organs, such as the brain, heart and lungs

Smooth Muscle

lacks striations; responsible for involuntary body activities


integrated group of cells with a common function, structure, or both

Urinary System

forms and excretes urine while regulating the amount of water and ions in the body fluids

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