Nerve impulses are caused by Potassium (K+) and Sodium (Na+) ions that are located inside and outside of the cell. The structure of the cell membrane is permeable to Potassium but are highly impermeable to Sodium ions. These impulses are transmitted from one nerve cell to the other in very fast series.
Answer:
D
Explanation:
Diffusion and osmosis are both passive forms of transport because there is no energy need to transport something such as water from an area of high pressure, to an area of low pressure.
Thymus is made up of two lines of lymphoid tissue, each line has a medulla surrounded by a vortex where immature lymphocytes first go to become T cells, but their maturation finishes in the medulla.
The spleen filters blood, removing old damaged red blood cells which are phagocytize by macrophages.
The tonsils help fight infections but removing
The appendix doesn’t have much of function but does release mucus into the large intestine.
N order for the immune system to protect the body against attack by foreign organisms, it must be able to distinguish between the body's own <span>proteins </span><span>(autoantigens) and proteins from foreign cells (foreign </span><span>antigens </span>). When the immune system turns against autoantigens, thus attacking its own tissues, the resulting condition is an autoimmune disease.<span>
<span /></span>
