Ch 1. 4, maintaining life

Question 1

maintaining boundaries

Answer 1

separating inside from outside

eg. skin, plasma membrane

Question 2

movement (contractility)

Answer 2

movement of body parts-skeletal muscle

substances-cardiac, smooth muscle, food, blood, urine

Question 3

responsiveness

Answer 3

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

Question 4

digestion

Answer 4

breakdown and absorption of food

eg. sugars, proteins, fats

Question 5

metabolism

Answer 5

all chemical reactions that occur in body cells

• catabolism; taking apart..breaking down substances
• anabolism; putting together..synthesizing sinple substances into complex

Question 6

excretion

Answer 6

removal of wastes

eg. urea, CO2, undigested food

Question 7

reproduction

Answer 7

making more cells for growth or repair

offspring

Question 8

growth

Answer 8

increase in size of body part or whole organism

usually by increasing cells

Question 9

nutrient need

Answer 9

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

Question 10

oxygen need

Answer 10

needed for ATP production, all nutrients need O2

Question 11

Water need

Answer 11

most abundant in the body
universal solvent
site of chemical reactions

Question 12

normal body temp, need

Answer 12

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

Question 13

Appropriate atmospheric pressure, need

Answer 13

for adequate breathing and gas exchange in the lungs

gravity