What is the key point of embryo formation?

1, filtration barrier: located in the renal capsule, formed by blood filtering from the capillaries of the blood vessel ball into the renal capsule. ...

2. Briefly describe hormones secreted by cell types in the distal part of adenohypophysis. ?

3. Briefly describe the definition of fertilization.

4. Discuss the composition, morphological structure and function of hepatic lobule in detail.

Extended data:

Embryogenesis

1. desmosomes (distribution, structure and function)

A: There are low-density filaments in the intercellular space connected by desmosomes, which interweave in the center of the gap to form a dense midline parallel to the cell membrane. There is an oval attachment plate on the cytoplasmic surface of cell membrane, which is composed of dense substances. There are many tension filaments attached to the attachment plate, which often return to the cytoplasm in a ring shape.

2. Haval system (definition, composition)

A: Also called osseous unit, it is a system composed of Haval's bone plate and Haval's canal. Havel's bone plate is located between the inner ring bone plate and the outer ring bone plate, and it is the main part of the dense bone of the shaft. They are arranged concentrically around the Havers Canal. There are blood vessels, nerves and a small amount of connective tissue in Haversian canal.

3. Reticulocyte (characteristics, structural characteristics, numerical value)

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