Arapid, irregular heartbeat is a symptom of
a. high blood pressure
b. stroke
c. atherosclerosis
d. heart failure
why is high blood pressure known as "the silent killer"?
a. it generally shows no symptoms.
b. it kills people while they sleep.
c. it generally increases the risk of heart attacks.
d. it kills by cutting off the airways.

A ) high blood pressure

B) it generally shown no symptoms

Explanation:

A ) high blood pressure

Series of tests by scientist have shown that as physical stress increases, calcium release increases, increasing heart contractions so that heart can pump harder against increased blood pressure.

B) it generally shown no symptoms

Hypertension is termed the silent killer since most high blood pressure sufferers had no signs to warn them to high pressure.

since you have not provided the options here i   am going to give you general overview about hormone.hormone are actually the part of endocrine system in our body and produced by the endocrine glands. the hormones act like a chemical messenger   within human body. once produce by the glands they   travel through the blood stream and reach at specific or target tissue and organs   which result in control of our body function. the hormones are specific in their work and work on only the targeted tissue or organ   . with the of hormone endocrine system regulate the heart rate , metabolism, our mood and   growth as well as the development and even the sleeping cycle etc. they actually are the messenger for body cell and organs .

you would have a std. i hope this .