Frequently Asked Question for Class 11th,12th, and NEET students (Skull and Cervical Vertebrae 2)
Question . Which part of the sphenoid bone ossifies by intramembranous ossification?
Ans: Lesser wing
Human Physiology
Joints: Meaning, Fibrous (or Immovable) Joints, Cartilaginous Joints, Synovial Joints, Ball-and-Socket Joints, Hinge Joints and Compound Joints
A joint or place of articulation is the location where two or more skeleton bones are joined to one another.
When two or more bones in the body come into close contact with one another and are joined by ligaments or cartilage, the result is a joint or place of articulation.
Thrombocytes (Platelets): Vascular spasm, Platelets plug formation, Coagulation (blood clotting)
Blood platelets are disc-shaped, non-nucleated cell fragments that range in diameter from 2 to 4 µm. In actuality, platelets are not cells. They come from fragments of the cytoplasm of megakaryocytes that live in the red bone marrow.
White blood cells (WBC) Leucocytes: Types , Neutrophil, Eosinophils, Basophils, Lymphocyte, Monocytes
WBCs are the largest blood cells. Leucocytes make up only over 1% of the blood volume, Leucocytes and erythrocytes differ in several ways:
1. Each leucocyte has a nucleus, mitochondria, and other organelles, proving that they are actual cells.
2. There is no Hb in them.
3. Erythrocytes are not movable, although leucocytes are.
4. Leucocytes can exit veins and penetrate the surrounding tissue, while erythrocytes typically do not leave the vascular system.
5. The lifespan of the majority of leucocytes is relatively short.