Hormones:the first step

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The movement of a substance from inside a cell to outside of the cell is called secretion.

Secretion
There are two types of secretion according to where the substance is when it is secreted from inside of a cell to outside of a cell. If the substance is outside of a cell as well as outside of the body border, the substance is secreted externally. For example, sweat is obviously secreted externally. Please remember that inside the intestinal tract was also outside the body border. From this, you can say that gastric juice, intestinal juice, pancreatic juice, and bile are also secreted externally. External secretion normally takes place through excretory duct.
If the secreated substance, which is outside of a cell, remains to be inside the body border, the substance was secreted internally. For example, secretion into the bloodstream is internal secretion.

Achievement Quiz
1. Secretion is the movement of a substance from [ a. inside a cell to outside of a cell / b. inside the body to outside of the body ].

2. Sweat is secreted [ a. internally / b. externally ].

3. Saliva is secreted [ a. internally / b. externally ].

4. Substances are secreted [ a. internally / b. externally ]into blood vessels.

5. Substances are secreted [ a. internally / b. externally ]into trachea.

6. Pancreatic juice is secreted [ a. internally / b. externally ].
Answer
1. The correct answer is a. "The movement of a substance from inside a cell to outside of the cell " . This is the definition of secretion.

2. The correct answer is b. You can see and wipe off sweat,so it must be secreted externally, to outside the body border.

3. The correct answer is b. You can easilly spit saliva out, can't you?

4. The correct answer is a. Is inside a blood vessel inside or ouside the body border?

5. The correct answer is b. Is inside trachea inside or outside the body border?

6. The correct answer is b. Is inside the intestines , where pancreatic juice is secreted into, inside or outside the body border?
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