Ch 1. 4, maintaining life Flashcards Preview

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Flashcards in Ch 1. 4, maintaining life Deck (13):
1

maintaining boundaries

separating inside from outside
eg. skin, plasma membrane

2

movement (contractility)

movement of body parts-skeletal muscle
substances-cardiac, smooth muscle, food, blood, urine

3

responsiveness

to stimuli, irritability
able to sense and respond
eg. withdrawal reflex

4

digestion

breakdown and absorption of food
eg. sugars, proteins, fats

5

metabolism

all chemical reactions that occur in body cells
-catabolism; taking apart..breaking down substances
-anabolism; putting together..synthesizing sinple substances into complex

6

excretion

removal of wastes
eg. urea, CO2, undigested food

7

reproduction

making more cells for growth or repair
offspring

8

growth

increase in size of body part or whole organism
usually by increasing cells

9

nutrient need

for energy and cell building
eg. sugars, fats, proteins, minerals, vitamins
carbs=body cells proteins=building cells

10

oxygen need

needed for ATP production, all nutrients need O2

11

Water need

most abundant in the body
universal solvent
site of chemical reactions

12

normal body temp, need

enzyme reactions require optimal temperature
if too high.. it will go to fast
37 degrees C

13

Appropriate atmospheric pressure, need

for adequate breathing and gas exchange in the lungs
gravity