Some substances, called secretions, travel in the interstitial fluid and affect neighboring cells. other chemical secretions, called secretions, affect only the secreting cell

1. Paracrine secretions

2. Autocrine secretions

Explanation:

Cell communication takes place in the form of chemicals secreted by the cells. The method or phenomenon of communication between cells is known as signalling.

The signalling process is categorized into three types depending on the distance between the cell producing the chemical and target cell are:

1. Autocrine signalling: Signalling takes place when the substances secreted by the cell acts on the same cell that produced it like IL-1 by macrophages.

2. Paracrine signalling: Signalling takes place when the substances secreted by the cell acts on the neighbouring cell like the Fibroblast growth factor which acts on the nearby cells.

3. Endocrine signalling: Signalling takes place when the chemicals produced by the cell acts on the target cell which is very distant from the secreting cell-like hormones.

Thus, Paracrine secretions and Autocrine secretions are correct.

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