c. cell wall, vacuole
Among the choices above, the two features that indicate that a cell is a plant cell is the cell wall and vacuole. The cell wall can only be found in plant cells. It is the rigid cell that surrounds the cell membrane. The vacuole of a plant cell and animal cell are way too different. The vacuole of an animal cell is usually more than one and small, even smaller that that of the plant cell. On the other hand, the vacuole of the plant cell is only one in fact a large one that takes up almost 90 percent of the volume of the cell
Answer:
Explanation:
1- closely packed osteons or haversian systems, used to provide strength and protection to bones.
2- Spongy bone consists of plates (trabeculae) and bars of bone adjacent to small, irregular cavities that contain red bone marrow. provides balance to the dense and heavy compact bone by making bones lighter so that muscles can move them more easily.
I think it's A. Tell me if I'm wrong.
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Answer:
The ability of an organism to mantain a stable internal enviorment while living in a changing external enviorment.
Histamine inhibits the chemotaxis which is the movement of cells along the gradient.
Histamine:
It is a neurotransmitter that is released by the mast cells in response to an allergen that causes an allergic reaction. It is responsible for redness of the inflamed area, heating, movement of leukocytes, and defense proteins to the site of injury. Histamine is responsible for vasodilation and increased permeability. The immune cells move to the site of injury and cause the flow of blood to the injured site. It plays an important role in allergic and hypersensitivity reactions. Histamine is also responsible for gastric secretion, smooth muscle contraction, and itching.
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