Unit 5 Equilibrium Homeostasis

Question 1

Homeostasis

Answer 1

Balance within the body

Regulated by feedback systems
Ex.
-[Oxygen + Carbon Dioxide]
-blood pH
-blood glucose
-blood pressure

Question 2

feedback system + its 3 compounents
1. Sensor
2. Control center
3.effector

Answer 2

-cycle to maintain homeostasis
1. Sensor: detects changes and signals control center (nerves)

2. Control Center: knows range of normalcy within body and how to counter balance changes (endocrine system)
3. Effector: acts on control centers will to counter changes (hormones, muscles contractions, ect.)

Question 3

Negative feedback
Vs.
Positive feedback

Answer 3

Negative feedback: mechanism to restore body to og state (homeostsis)

Ex. Thermal regulation
Body temp rises –> receptors –> hypothalamus(control center) –> vasoconstriction –> less heat lost

Body temp drops –> receptors –> hypothalamus(controll center) –> vasodilation –> holds onto heat

Positive feedback: mechanism to amplify changes to body

Ex. Childbirth
Decrease progresterone –> uterine contrations –> posterior pituitory(controll center) –> oxytosin released (effector) –> child is bitn

Question 4

Thermoregulation
-Homeotherms
Vs
-Poikiotherms

Answer 4

Homeotherms: animals maintan stable body temp
human + bird

Poikiotherms: body temp varies cuz environment
fish + reptiles

Question 5

Thermoregulation
Endotherms
Vs
Ectotherms

Answer 5

Endotherms: increase metabolic rate –> generate heat

Ectotherms: lowers metabolic rate –> conserve energy

Question 6

Blood glucose levels regulation
Too high
Vs
Too low

Answer 6

Too high: beta cells in pancreas secrete insulin

Too low: alpha cells in pancreas secrete ** glucagon**