Nerve06/autonomic nervous system and synapses/catecholamine receptors

提供:一歩一歩
2014年9月12日 (金) 17:44時点におけるAdmin (トーク | 投稿記録)による版
ナビゲーションに移動 検索に移動

There are two types, alpha receptors and beta receptors, of receptors for catecholamines. Depending on the organs innervated by the sympathetic nerves, the dominance of the alpha receptors and beta receptors differ.

02538en.jpg

02537en.jpg Alpha receptors: vascular smooth muslces (contraction, increase in blood pressure). gastrointestinal sphincters contraction. pupillary dilatator contraction.

Beta receptors: cardiac muscles (increase in heart rate and contraction), relaxing of the airway smooth muscles.

Challenge Quiz

1.

The catecholamine receptors in the vascular smooth muslces are mainly the alpha. beta receptors. When they are stimulated the blood pressure is lowered.elevated .

2.

The catecholamine receptors in the heart muslces are mainly the alpha.beta receptors. When they are stimulated the cardiac contraction is fasciliated. inhibited and the heart rate is increased. decreased .

3.

The catecholamine receptors in the airway smooth muslces are mainly the alpha.beta receptors. When they are stimulated the airway is dilated. constricted .