Answer:
Intramembranous ossification begins with differentiation of mesenchymal cells.
Explanation:
Fibrous membranes are involved in the development of the bones. The process through which this occurs is termed as the intramembranous ossification.
The cells of the mesenchyma begin to split. These cells differentiate into specialized cells each performing different functions. The following bones are formed by the process of intramembranous ossification:
- mandible
- clavicle
- some bones of the skull
Answer:
c. causes cells to swell and burst, whereas apoptotic cells shrink and condense
Explanation:
These two mechanism are responsible for death of cells in multi cellular organisms.Apoptosis is naturally occurring process which is well organised and programmed.It is ensures the automatic death of old and worn out cells, needed for certain cellular developments. This is demonstrated by DNA fragmentation,cell shrinkage,and the break down of the nuclear walls.It can be initiated through two pathways of intrinsic and extrinsic,The latter leads to death from internal factors,while in the former is when external factor causes the death .
However,when cell death is influenced by external factors(toxins) in the cell environments,which lead to unpredictable or unregulated process leading to cell death ,the process is called Necrosis.it is demonstrated with the swelling and busting of the cell.and characterised with inflammation. It is an accidental death which causes injuries to the cells and tissues.
All infectious agents cause sicknesses. Viruses, bacteria, and fungi are the different groups of infectious agents.
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its c at the end of meiosis each gamete has two full sets of chromosomes
