B. Fill in the blanks. . 1h are chemical substances that are produced by glands and help to regulate body functions 2. The gland is the largest endocrine gland in the body. 3. The rhythmic contraction and relaxation of the heart muscles are initiated by a tissue called Sino atrial 4. The flow of blood in the chambers of the heart is ensured by the presence of 5. The contraction phase of the heart is termed as
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1) Hormones are the chemical substances that are produced by the glands and help to regulate body functions
2) the pancreas is the largest endocrine gland in the body
3) The rhythmic contraction and relaxation of the heart muscle are initiated by a tissue called sino atrial node.
4) the flow of blood in the chambers of the heart is ensured by the presence of valves.
5) the contraction phase of the heart is termed as systole
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