Question

20. which of the following is true regarding residual air in the alceoli? seect all that appy

a. mixes with newly-inspired air,reducing exugen pressure in the alveoli and reducing oxygen uptake efficinecy in mammal lings

b. prevents the alveoli from collapsing during life

c. is a primary source of nitrogen gas absorbed in the lungs

d. can be forcefully exhaled in certain circumstances such as intense strenuous activity

35. A neurotransmitter which binds a G protein-linked receptor would likely exhibit a _______ response relative to a neurotransmitter which binds a ligand gated ion channel.

A. slower to develop, and a smaller scale response localizes to a single region of the cell

B faster to develop, but longer and more cell-wide responde

C. slower to develop, but larger scale and more cell-wode response

37. The half-life of a hormone allows one to determine.... select all that apply

a. the rate at which hormones are eliminated from the body

b. the identity of a hormone

c. the rate of action of a hormone

d. the rate of travel through the blood to a target

Answer 1

20.b. prevents the alveoli from collapsing during life

Residual volume  is the volume of air that cannot be expelled from the lungs. This volume remains unchanged regardless of the lung volume at which expiration was started.The residual volume functions to keep the alveoli open even after maximum expiration. In healthy lungs, the air that makes up the residual volume allows for continual gas exchange to occur between breath

35.

C. slower to develop, but larger scale and more cell-wode response

Endocrine hormones like catecholamines bind to G-protein-linked receptors, it is typical of endocrine hormones unlike the neurons to act slower but have more cell wide response because endocrine system secrets hormones that reach their targets through the bloodstream, hence slower.

37.a.) the rate at which hormones are eliminated from the body

Half life is defined as  is the time it takes for a substance such as a hormone or drug to lose half of its pharmacologic or physiologic activity.