Download App

Control and Co-ordination — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYControl and Co-ordination5 Marks
Question
Patient suffering from hypothyroidism shows increased level of $\text{TSH}$. Why?
✓

Answer

  1. Hypothyroidism means decrease in the secretion of $T_3$ and $T_4$
  2. Decrease in $T_4, i.e$. thyroxine in the blood triggers negative feedback mechanism.
  3. The hormone receptors in hypothalamus detect this change and secrete $\text{TRE}$
  4. $\text{TRF}$ stimulates the pituitary to secrete $\text{TSH}$
  5. Thus, Patient suffering from hypothyroidism shows increased level of $\text{TSH}$ due to negative feedback control.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Answer the following questions in detail." from Control and Co-ordination→Control and Co-ordination — all question types→BIOLOGY STD 12 Science question papers→Maharashtra Board STD 12 Science question papers→Maharashtra Board question paper generator→

Similar questions

Electrical and chemical synapses:
→
Only 20 amino acids are considered as standard.
→
Fish farming.
→
Complete the table.
EventPhysical process
1. Soaking of Seeds—————-
2. Water entering guard cells—————-
3. Exchange of gases—————
4. Loss of water in liquid form—————
5. Water coming out through earthen pot—————
6. Loss of water in vapour form—————
7. Absorption of solutes passively by carrier—————
8. Spreading of fragrance of incense stick—————
→
Primary sex organs and Secondary sex organs.
→
Give a cross of co$-$dominance using a suitable example.
→
Describe the main ideas behind the biological control of pests and diseases.
→
You have a friend whose parents are too indulgent in his/her daily affairs. They think him/her to be still young which makes him/her sad and is upset all the time. As he/she feels that the parents should give him/her opportunity to take independent decision on some issues.
  1. Would you support your friend and why?
  2. Write the characteristics of this age group.
  3. List two curative measures.
→
  1. Describe the characteristics a cloning vector must possess.
  2. Why DNA cannot pass through the cell membrane? Explain. How is a bacterial cell made ‘competent’ to take up recombinant DNA from the medium?
→
  1. With labelled diagrams, depict the stages in embryo development in a dicotyledonous plant.
  2. Endosperm development precedes embryo development. Why?
→