Fill in the blanks:
The rhythmic expansion and contraction of heart is called................ .

The rhythmic expansion and contraction of the heart is called ______.

The phase of contraction of heart is termed as _____.

Fill in the blank A figure which ends at the strating point is called a ………..

Fill in the blanks: The combination of two or more cells is called a ________.

Fill in the blanks: The process of obtaining and utilization of food by an organism is called.............. .

Rhythmical contraction is noticed in

What are the contraction and relaxation of the heart called ?