Homeostasis packet

homeostasis

mainbtain a state of internal balance or constancy

variable

condition subject to change

regulated variables

-body temperature

-volume and composition of body fluids

-blood levels of oxygen and carbon dioxide

-blood pressure

Must remain somewhat narrow range, or set point, to stay healthy

Must remain somewhat narrow range, or set point, to stay healthy

regulated variables

-body temperature

-volume and composition of body fluids

-blood levels of oxygen and carbon dioxide

-blood pressure

disease

state of homeostatic imbalance

-Main _ for maintaining _

-Keeps _ within set _ by reversing upward or downward (doesn’t always mean less response; just means opposite response)

method

homeostasis

regulated variables

range

-3 components of negative feedback loops

-_ measures the level of the variable

-_compares sensor inputs with set point

-_increases or decreases activity to alter the level of regulated variable to restore normal levels

-signals carry information between the components

A sensor

A control center

An effector

-Barries preserve _ environments to maintain homeostasis by _ constant internal from changing external

distinct

separating

Examples:

-_: barrier separating inside from outside

-_: barrier on body’s tubes

-Digestive tract, airways, reproductive tract, urinary tract

-_: separates the intracellular & extracellular fluids

-_: fluid within cells

-_: fluid outside cells (blood plasma, lymph)

skin

mucus membrane

plasma membrane

intracellular fluid

extracellular fluids

what membrane is this?

Cutaneous membrane (skin)

what membrane is this?

Plasma membrane

what membrane is this?

mucus membrane

what does the mucus membrane consist of?

respiratory tract

digestive system

urinary tract

salivary glands

Gradient

-_ in specific _ value between

two areas

-Examples: pressure, temperature, concentration

A difference

physical or chemical

Flow

-_ of a substance from one area to another

-Water & solutes across _

-Flow of _ through blood vessels

-_ through airways

movement

plasma membrane

blood

air

Resistance

-Factors that _ flow down a gradient

-Examples: friction, barriers

-_ surface provides _ resistance & permits greater flow

-_ provide _ to flow

inhibit

smoother

less

barriers

resistance

what does this image show?

Normal blood flow

Restricted blood flow

what does this image show?

Normal artery

Artery with plaque build-up