Describe the different cell types and their functions in sponges.

Sponges belong to phylum Porifera.

Different cell types and their functions are as follows:

1. Pinacocytes - It forms the outer layer of the sponge. It sometimes helps in phagocytosis of food particles.

2. Lophocyte or Collenocyte - these cells secretes collagen.

3. Porocyte - it controls the water flow through ostia.

4. Amoebocyte - provides nutrients to the cell.

5. Chanocyte - generates water current and filters food particles from water.

6. Sclerocyte - secretes silica spicules.

7. Oocyte - egg cell.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.

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