Anatomy and Physiology Exam #117 cards

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1

Effector

A peripheral gland or muscle cell innervated by a motor neuron.

2

Negative Feedback

A corrective mechanism that opposes or negates a variation fromnormal limits

3

Homeostasis

The maintenence of a relatively constant internal environment

4

Diffusion

Passive molecular movement from high to low concentration

5

Osmosis

The movement across water through a selectively permeable membrane from one solution to another solution with a higher concentration of solute.

6

Covalent Bond

A chemical bond between atoms, that involves the sharing of electrons

7

Ionic Bond

A molecular bond created by the attraction between ions with opposite charges

8

Phagocytosis

The engolfing of extracellular materials or pahogens; the movement of extracellular materials into the cytoplasm by an enclosure in a membranous vesicle

9

Cilia

A slender organelle that extens above the free surface of an epithelial cell and generally undergoes cycles of movement composed of basal body and microtubles in a 9 + 2 array

10

Microvilli

Small, finger-like extensions of the exposed plasma membrane of an epithelial cell

11

Vesicle

A membranous sac in the cytoplasm of a cell

12

Membrane

any sheet or partition, layer consisting of epithelium and the underlying connective tissue

13

Dissociation (Ionization)

The breakdown of a molecule in solution to form ions

14

Variable

Independent & Dependent... one stays controlled while the other changes

15

Cell

The smallest living unit in the human body

16

Endocytosis

The movement of relatively large volumes of extracellular material INTO the cytoplasm via the formation of a membranous vesicle at the cell surface; includes pinocytosis and phagocytosis

17

Exocytosis

The EJECTION of cytoplasmic materials by the fusion of membranous vesicle witht eh plasma membrane