B1f-staying In Balance Flashcards Preview

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Flashcards in B1f-staying In Balance Deck (17)
1

What bodily inputs and outputs are balanced?

-levels of co2
-water content
-body temperature

2

What is negative feedback?

A mechanism that works automatically to help you keep conditions in your body steady

3

What is the normal core temperature of the human body and why?

37c is the optimum temperature for the action of many enzymes

4

What procedures can be taken to measure body temperature?

Clinical thermometer
Sensitive strips
Digital recording probes
Thermal imaging

5

What can high temperatures cause?

Heat stroke
Dehydration
Death

6

What can low temperatures cause?

Hypothermia
Death

7

What temperature control mechanisms are initiated when you're too hot?

-hairs lie flat
-sweat transfers heat from skin to environment
-vasodilation (blood vessels widen, more blood flow near skin , more heat into surroundings)

8

What temperature control mechanisms are initiated when you're too cold?

-hairs stand up to trap air
-little sweat
-vasoconstriction( blood vessels near surface constrict, less heat loss to surroundings)
-shivering generates heat

9

What is homeostasis?

Maintaining a constant internal environment

10

What does the thermoregulatory centre in the brain do?

It has receptors that sense blood temperature in brain
Receives impulses from skin that provides info about skin temperature

11

How does the brain respond to information on skin temperature?

Brings changes in body's temperature using nervous and hormonal system

12

What is type 1 diabetes?

When the pancreas produces little or no insulin
Need to inject insulin several times a day

13

What is type 2 diabetes?

When a person is resistant to insulin
Controlled by limiting intake of foods rich in simple carbohydrates

14

How does insulin help regulate high blood glucose levels?

Pancreas releases insulin
Insulin is a messenger
Liver stores glucose as glycogen
Blood glucose reduced

15

What happens when blood glucose levels are too low?

Pancreas releases glucagon
Glucagon is a messenger
Liver releases glycogen back as glucose
Blood glucose increased

16

Why are responses controlled by hormones slower than ones controlled by nervous system?

Hormones travel in blood
Electrical impulses sent along nerves travel much faster

17

Why does dosage of insulin depend on diet and how active someone is?

Vigorous exercise removes glucose from blood
Foods rich in simple carbohydrates cause glucose levels to rise rapidly