Isovolumetric contraction and Isovolumetric Relaxation
Sympathetic stimulation (I'm guessing you mean your bodie's reaction in fight or flight) makes the blood vessles tighten, or constrict, hightening blood pressure. This is bad for you over long periods of time.
You do not have noticeable Braxton Hicks contractions until you are in your 2nd and 3rd trimesters. But no you probably aren't pregnant. You cant tell 2 weeks before your missed period that you are pregnant without the help of a pregnancy test.
AutorhythmicityThe heart is made of tissue that is specific to the cardiac muscle. The beating of the heart, in most healthy individuals, intrinsically arises in the SA (sino atrial node) in the upper right chamber of the heart. A normal resting heart rate is commonly considered to be between 60 and 100 beats per minute. In some very well trained athletes or in periods of meditation a normal resting heart rate may be less than 60.
There is a possibility of exercise burnout if an exercise program is not varied and adequate rest periods are not taken between exercise sessions. Muscle, joint, and cardiac disorders have been noted among people who exercise.
The starting AND ending of your periods. :)
rows. the vertical columns are called periods
7 periods
the periods are the rows
No - only mammals have periods.
periods, they are periods
they dont have periods.
Periods have same shells. There are 7 periods in periodic table.