Click on the only statement below that is true The heart is not considered part

Question

Click on the only statement below that is true The heart is not considered part of the endocrine system. Throughout the body, there are only a small number of endocrine glands and hormones Exocrine glands are ductless glands that release hormones into the blood A single endocrine gland only secretes one type of hormone All hormones reach their target cells by traveling in the blood The target cell for a hormone must be located very close to the hormone-secreting cell Endocrine glands secrete their products into a duct, from where the secretions either exit the body (i.e Chemical messengers released into the blood by axon terminals in the A single chemical substance can only be classified as one of the following: a hormone a neurotransmitter, a sweat) or enter the lumen of posterior pituitary are called paracrine substance , or an another organ (i.e stomach) neurotransmitters autocrine substance

Explanation / Answer

All hormone reach their target cells by travelling in the blood. This statement is correct.
A single chemical substance can only be classified as one of the following: a hormone, a neurotransmitter, a paracrine substance, or an autocrine substance. This statement is correct.

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