Answer:
It is a cycle of contraction and relaxation of atria and ventricles.
Explanation:
The cardiac cycle is the sequence of electrical, mechanical, sound and pressure events, related to the flow of blood through the cardiac cavities, the contraction and relaxation of each of them (atria and ventricles), the closure and opening of Valves and noise production. This process takes place in less than a second. The reciprocal of the duration of a cycle is the heart rate (as usually expressed in beats per minute, multiply by 60 if the duration is measured in minutes).
Answer:
Ecstasy drug
Explanation:
Ecstasy drug also known as MDMA or 3,4-Methyl enedioxy methamphetamine is a psychoactive drug.
The drug is taken to alleviate the level of energy and pleasure which are caused by increasing the activity of other neurotransmitters like dopamine and serotonin.
In the given question, since the Sarah is full of energy and behaves in an optimistically manner therefore she has most probably taken the ecstasy drug.
Thus, Ecstasy drug is the correct answer.
Answer: <u>Intrinsic</u> should be the correct answer.
