As humans, we have receptors for two kinds of beta adrenergic compounds such as catecholamines. cardiac muscle cells have beta 1 receptors that promote increased heart rate. some drugs that slow heart rate are called beta blockers. smooth muscle cells, however, have beta 2 receptors which mediate muscle relaxation. blockers of these effects are sometimes used to treat asthma. the use of beta 2 antagonist drugs may be useful in asthma because:

Because a drug acts on one type of receptor does not mean that it will act on another type.

Explanation:

As humans, we have receptors for two kinds of beta adrenergic compounds such as catecholamines. Cardiac muscle cells have beta 1 receptors that promote increased heart rate. Some drugs that slow heart rate are called beta blockers. Smooth muscle cells, however, have beta 2 receptors which mediate muscle relaxation. Blockers of these effects are sometimes used to treat asthma. The use of beta 2 antagonist drugs may be useful in asthma because a drug acts on one type of receptor does not mean that it will act on another type.

i'm guessing this is from edg enuity so the answers would be, from top to bottom,

theodor schwann

matthias schleiden

robert hooke

rudolph virchow

anton van leeuwenhoek