Homeostasis

Question 0

Internal environment

Answer 0

Extracellular fluid - fluid around cells and tissues+blood plasma

Question 1

Define homeostasis

Answer 1

The physio state of the body in which internal physical and chemical conditions are kept within a suitable range for life processes.
Body adjusts to fluctuating environ conditions, allowing it to main constant balance –> dynamic equilibrium

Question 2

Interstitial fluid

Answer 2

Fluid surrounding cells

Question 3

List examples of internal conditions whose balance is maintained

Answer 3

Temperature, chemical composition, pH

Question 4

How might illness upset homeostasis

Answer 4

Render control system nonfunctional

Question 5

Three components of homeostatic control system + their functions

Answer 5

1. Monitor-sensors/receptors that receive stimulus+send msg
2. Coordinating centre-an integrator that relays info to appropriate loc in body for response
3. Regulator-An effector that executes response

Question 6

Negative feedback + ex

Answer 6

Response that restores EQLM by reversing any changes made
Maintains homeostasis.
Ex. Temperature regulation

Question 7

Positive feedback + ex

Answer 7

Response that acts to increase effect of change, intensifies change away from EQLM
Does not maintain homie o stasis
Ex. Child birth

Question 8

Def Thermoregulation

Answer 8

Maintaining body temp within a narrow range around a set point

Question 9

Two control mechanisms when body is hoooooooot ;)

Answer 9

1 sweating –> evaps and cools

2. Blood vessel dilation –> more flow to skin and loss of heat from skin

Question 10

Three control mechanisms when it’s cooooool

Answer 10

1. Vasoconstriction, less flow to skin, reduced heat loss
2. Skeletal muscle contract, shivering generates E production
3. Body hair erects to conserve heat

Question 11

What causes heat stroke

Answer 11

Sweating for cooling is inefficient due to very high temp, humidity, andor exertion

Question 12

Wilfred Bigelow’s two discoveries

Answer 12

• . Helped develop first artificial pacemaker

2. How to safely lower body need for O2 by lowering temp—> made open heart surgery possible

Question 13

Cryogenics

Answer 13

Study of how materials behave at low temp

Question 14

Examples of body responses during f or f

Answer 14

1. Increased adrenaline level–>enhanced body fn
2. Capillaries under skin surface close down->High blood pressure
3. Rapid heart bumping
4. Eyes dilate for better sight
5. Useless functions shut down

Question 15

Examples of functions that shut down during f or f

Answer 15

1. Digestion
   2 immune system
2. Sexual fns

Question 16

Fight or Flight

Answer 16

Set of body responses during life threatening situation

Question 17

Which part of brain signals f or f

Answer 17

Hypothalamus

Question 18

False alarms and their effects

Answer 18

Not actually life threatening situation triggering f or f

Can cause stress related disorders: heart disease, high blood pressure, migraine headaches

Question 19

Examples of homeostasis

Answer 19

Thermoreg
pH buffer acidosis and alkalosis
Blood sugar