Question

1. type of cell are targeted by the HIV vires.    2. where is surfactant found.                               3. what breathing receptors respond to changes in PRESSURE in the airway.                  4. chemoreceptors are located in carotid and aortic bodies.                                                       5. which type of alveolar cell produces surfactant.                                                             6. type of cell promote production of B cells.    7. Gas exchange takes place across which type of alveolar cell.

Answer 1

Answer=

1] Type of cells that are targeted by HIV virus are

vital cells in human immune system such as helper T cells (CD 4⁺) cells ,macrophages and dendritic cells.

===================================================================================

2]   surfactant is found in the fluid lining the alveolar surface of the lungs.

3] breathing receptors respond to changes in PRESSURE in the airway are chemoreceptors.

breathing is controlled through feedback by chemoreceptors; 2 types

a]arterial chemoreceptor- it monitors & responds to changes in the partial pressure of oxygen & carbon dioxide in the arterial blood.

b] Central chemoreceptors - are located on the ventrolateral surface of medulla oblongata and detects changes in pH of cerebrospinal fluid.

======================================================================================= 4] chemoreceptors that are located in carotid and aortic bodies are peripheral chemoreceptors.

======================================================================================= 5] type II alveolar cells produces surfactant.   

=============================================================================

6] T cells promote production of B cells.

===============================================================================

7] Gas exchange takes place across type I of alveolar cell.