homeostasis (temeprature)

Question 1

radiation

Answer 1

• There is no direct contact with the source

gain or loss

Question 2

convection

Answer 2

• Occurs when hot or cold air passes over a body

gain or loss

Question 3

conduction

Answer 3

• Occurs from direct contact with heat source

gain or loss

Question 4

evaporation

Answer 4

• Transformation of water from liquid to gaseous state

loss only

Question 5

how hot is too hot for the body?

Answer 5

42 is dangerous and 45 is deadly

Question 6

what causes a heat stroke?

Answer 6

body temperature rises, regulatory mechanisms cease, fatal if brain cells are affected

Question 7

what causes heat exhaustion?

Answer 7

Loss of water ( sweating) reduces volume of blood plasma and vasodilation
Vasodilation reduces blood flow resistance decreasing blood pressure and cardiac output

Question 8

why do we need to be at 37 degrees?

Answer 8

Chemical reactions are optimum at 37c if not;

• Increase of temperature
• Nerve malfunction
• Change protein structure
• Death

Question 9

what causes temperature variation?

Answer 9

• Activity
• External changes
• Daily body cycle: low am and higher pm
• Women higher in 2nd half on menstrual cycle

Question 10

what causes heat production?

Answer 10

Carbohydrates, proteins, and lipids contain energy in chemical bonds that hold molecules together

Question 11

what is heat used for?

Answer 11

muscle contraction, active transport and building molecules

- when cellular respiration occurs for energy release

Question 12

how does metabolism impact temperature?)

Answer 12

Cellular respiration creates heat
Heat from stress and excercise; sympathetic nerves release noradrenaline
- Increases metabolic activity
Too cold metabolic rate slows, heat production cant replace lost heat