Question
Thrombocytes are essential for coagulation of blood. Comment.
✓
Answer
Blood is a connective tissue. It has many cellular components. Thrombocytes or platelets are one of them. Thrombocytes or platelets are found in blood. There number in the blood is 250,000/cubic mL of blood. They are formed in bone marrow and their life span is one week. When an injury is caused in the blood vessel, bleeding starts, and the platelets are disintegrated to release the clotting factor 3 called thromboplastin. This in presence of Ca2+ ions activate prothrombokinase. A series of reactions ultimately occurs which causes blood to clot and plug the injured blood vessel thus preventing further loss of blood.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Describe the different levels of organisation of body of animals, with an example for each.
A cyclic process is occurring in C3-plant, which is light dependent and needs O2. This process does not produce energy rather it consumes energy.
- Can you name the given process?
- Is it essential for survival of the plant?
- What are the end products of this process?
- Where does it occur?
- Does it occur in C4-plants also.
Explain ETS.
Mention any five hormones secreted by anterior pituitary and mention their functions.
Explain, why a pair of homologous chromosomes is genetically different, but a pair of sister chromatids is genetically identical before crossing over in meiosis.
Write the difference between:
Pectoral and Pelvic girdle
Pectoral and Pelvic girdle
What is Calvin cycle? What is the importance of Calvin cycle?
Describe the basic characteristics of a photosystem and explain how photosystem I differs from photosystem II.
Lakshita was studying endocrine system for her unit test. She was confused how hormones produce their effects on the target tissue.
She read many times, but still did not understand the process. She asked the same to her neighbour Stuti, a biology teacher in a school. Stuti explained her about the hormone receptor complex through diagrams and flowcharts.
She read many times, but still did not understand the process. She asked the same to her neighbour Stuti, a biology teacher in a school. Stuti explained her about the hormone receptor complex through diagrams and flowcharts.
- Name the two types of receptors.
- Why do different hormones use different types of receptors?
- What are second messengers? Give two examples?
- What values reflect from Lakshita's character?
- Study the given structure carefully and label the parts given as A, B, C, D and E.
- Give one major function of each of these.
