Answer:
The first heart sound (S1) represents closure of the atrioventricular (mitral and tricuspid) valves as the ventricular pressures exceed atrial pressures at the beginning of systole (point a). S1 is normally a single sound because mitral and tricuspid valve closure occurs almost simultaneously.
Explanation:
About 88 percent of geologic time is represented by the time span called the precambrian <span>era.</span>
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Answer: the number of cells increases
Explanation:
The changes experienced by a human, from birth to 16 years old in form of growth is facilitated by the increase in the number of cells.
Most tissues in the human body grow by increasing their cell number, but this growth is being monitored and regulated to maintain a balance between the different tissues.
Answer:
HERE IS YOUR ANSWER
Explanation:
IT IS POSITIVELY CHARGED AND INCLUDES MOST OF THE ATOM'S MASS . B OPTION .
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Rachana
