Homeostasis

Question 1

Define homeostasis

Answer 1

Maintenance of nearly constant conditions in the internal environment
Conditions in which the body internal environment remains relatively constant within its limits

Question 2

What are the conditions of homeostasis?

Answer 2

An organism is in homeostasis when its internal environment
contains optimum concentration of gases, nutrients, ions and water
has an optimal temperature
has an optimal pressure for the health of the cells

Question 3

What are the differences between the extracellular and intracellular compartments?

Answer 3

sodium(Na+) and chloride (Cl-) most abundant extracellular ions
Potassium(K+) and Phosphorus(PO4-) most abundant intracellular ions

Question 4

What is negative and positive feedback?

Answer 4

negative: change in parameter causes a response that results in a return of that parameter to normal
ex: changein arterial pressure
Positive: change in parameter causes a response that results in an increase of the parameter. ex: child birth

Question 5

What is gain?

Answer 5

Degree of effectiveness with which a control system maintains homeostasis.
gain=correction/error
correction= change in a controlled system minus change in a uncontrolled system

Question 6

Cell membrane structure

Answer 6

phospholipid bilayer with hydrophilic heads and hydrophobic tails and proteins (peripheral or integral) associated with membrane

Question 7

cell membrane function?

Answer 7

selective filter

separate intracellular and extracellular compartments

Question 8

Major organelles and functions

Answer 8

Nucleus-stores DNA
ER-synthesize proteins
Golgi apparatus-packages proteins
mitochondrion-produces energy (ATP)
lysosome-digestion

Question 9

What is human physiology?

Answer 9

Study of the functional organization of the human body