Question about homeostasis?

Question

in homeostasis, body parts function efficiently only when the concentrations of water, food substances, and oxygen, and the conditions of heat pressure

A. remain perfectly static and do not vary

b. remain within certain limited ranges

c. never go up or down

d. fluctuate greatl between very high and low values.

homeostatic mechanism act by negative feedback because changes away from the normal state

a. stimulates changes to occur in the same direction

b. inhibit all body reactions

c. stimulates changes to occur in the opposite direction

d. stimulate a reduction in all vital needs of the body

in the anatomical position, what is the position of the palms and forearms

a. palms are facing anteriorly and forearm is pronated

b. palms are facing anteriorly and forearm is supinated

c. palms are facing posteriorly and forearm is pronated

d. palms are facing posteriorly and forearm is supinated

Answer 1

a-homeostasis simply refers to the body or any system prefering to stay constant, the body will regulate hormones and enzymes etc in order to accomplish this

c-negative feedback loop, body detects high amounts of CO2, causes increased rate in breathing in order for the body to reduce total concentration of CO2 in blood and cells, returning it to the original state

b/d not quite sure of this one

all mainly based on biology 12 knowledge...

Answer 2

B- the body can only withstand certain limits, eg increase in blood temperature, and increase in acidity. The body maintains these limits through homeostatis. Variation are inevitable, eg. some foods increase acidity in blood.

C- the body needs to maintain homeostatis, but returning to normal conditions

A- the palms face down (anterioly) and the forearms are pronatated, pushing outwards. This is the natural postion of the arm

Good luck