Animal form and function Flashcards
tissues
groups of cells with common function
organs
tissues organized into a function unit
organ systems
groups of organs that work together to perform vital body functions
epithelia tissue
occurs as sheets
cells tightly connected
prevent materials leaking between cells
barrier to pathogens, fluid loss
control of absorption
connective tissue binds and supports other tissues
cells scattered in a extracellular matrix
matrix consists of fibers in a liquid, jelly, or solid foundation
skeletal muscles
voluntary movement
smooth muscle
involuntary movements
nervous tissue
collecting, processing, transmitting information
glial cells
provide metabolic support to neutrons
excretory system
removal of metabolic waste, regulation of osmotic balance
endocrine
coordination of body activities via hormones
glands secrete hormones
hormones travel through the blood stream to receptors on cells
homeostasis
maintaining a stable internal environment
organisms maintain homeostasis for particular physical conditions
pH, solute concentration, temp
endotherms
regulators for internal temperature
osmoregulators
regulate concentration fo solutes in body fluids
negative feedback for maintaining homeostasis
returns body system to a set point, reverses a change
positive feedback for maintaining homeostasis
intensifies a change in a body system
thermoregulation
process by which animals maintain body temperature within normal range
ectothermic
gain heat with external sources
ectotherms
adjust their body heat behaviorally
movein and our of sub
change orientation to sun
w
endothermic
warmed by heat generated by metabolism
birds, mammales, many bees, wasps, moths
adjust body heat to evaporate heat loss
vasodilation
blood vessels expand, closer to skin surface, radiate heat
vasoconstriction
blood vessels constrict, farther skin surface, retain heat
