If there were spare alfa1-adrenergic receptors on cardiac muscle cells, which statement would be correct?

Question

Answer

A maximal effect of epinephrine is seen when only a portion of ?1 adrenergic receptors are occupied.

Answer

Spare alfa1 adrenergic receptors make the cardiac tissue less sensitive to epinephrine.

Answer

The number of spare ?1-adrenergic receptors determines the size of the maximum effect of the agonist epinephrine.

Answer

Spare receptors are active even in the absence of epinephrine.

Crowdly