Chapter 5 physiology Chapter 5 physiology Can you please check these answers and

Question

Chapter 5 physiology Chapter 5 physiology Can you please check these answers and verify if they are correct? If they are not correct can you please state why? 1) In chemical communication between cells, a cell secretes a chemical messenger that binds to cells. called a on a. Target; Secretory; receptors b. Receptors; target; ligand c. Secretory; target; receptors G Ligand; receptors; target Which type of chemical messenger, when released, binds to receptors on the cell that released the chemical messenger? 2) a. Autocrine b. Paracrine c. Endocrine d. Exocrine Which type of chemical messenger is released from one cell and binds to receptors on neighboring cells? 3) a. Autocrine Paracrine c.Endocrine d. Exocrine Which type of chemical messenger is released into the bloodstream by an endocrine gland where it can affect targets throughout the body? 4) a. Cytokines Hormones c. Neurotransmitters d. Eicosanoids 5) Which type of chemical messenger is released from the axon terminal of a neuron and directly stimulates other cells? a. Cytokines b. Hormones Neurotransmitters d. Eicosanoids

Explanation / Answer

2. Autocrine means cell produced the substance that has an effect on the cell by which it is secreted.

3. Paracrine is a hormone which has effect only in the vicinity of the gland secreting it.

4. Chemical messenger molecules carried in the blood by endocrine glands are called hormones where it can affect the target organs.

5. Chemical messenger is released from the axon terminal of a neuron and directly stimulates other cells are called neurotransmitters.

6. ADH or vasopressin is released by posterior pituitary glands. It is a kind of neurohormone. The neurohormones in most mammals include oxytocin and vasopressin, both of which are produced in the hypothalamic region of the brain and secreted into the blood by the neurohypophysis.

7. Peptide hormones are lipophilic

8. True.

9. True.

10. False. Adenyl cyclase converts ATP into cAMP.

11. False because lipophilic ligands bind to cell membrane receptors, not to the nuclear receptors.

12. True. Eicosanoids for inflammation, fever, blood clotting etc and steroids derived from cholesterol eg sex hormones.

13. True.

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