and their activitles iin yu orennerhin a neurotransmitter) channels to remaino S

Question

and their activitles iin yu orennerhin a neurotransmitter) channels to remaino Sympathetic axon terminals release onto SA Nodal cells which binds to odenne receptors which cause (closed/open). The result is that more of this ion entere (enters/exits) the cells. The result is a stot (longer/short) period of time is required to reach threshold- hence ahoty(longer/shorter) cardiac cycle and a fistey(faster/slower) slower HR. The sympathetic NS is able to adjust HR in two ways. By releasing Puicioes (a signaling moleculr) directly onto the no (target effector-be specific), or by causing this endocrine gland to release ep and hor epi it nffnrt on the heart? (LAB) HR

Explanation / Answer

Nor epinephrine

Adrenergic

Na+;Ca+

Open

Enter

Short

Shorter

Faster

Protein couple receptors

SA node

Epinephrine and nor epinephrine

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