Hey there! We receieved your request
Stay Tuned as we are going to contact you within 1 Hour
One of our academic counsellors will contact you within 1 working day.
Click to Chat
1800-5470-145
+91 7353221155
Use Coupon: CART20 and get 20% off on all online Study Material
Complete Your Registration (Step 2 of 2 )
Sit and relax as our customer representative will contact you within 1 business day
OTP to be sent to Change
Question1: Which one of the following is not a second messenger in hormone action? [CBSE PMT’2006]
(a) Calcium
(b) Sodium
(c) cAMP
(d) cGMP
Answer: b
Solution:
In heart cells AMP acts as secondary messenger which is made in the response of adrenaline and it stimulates Ca2+ ions to come out from the sarcoplasmic reticulum of muscle fibres which causes muscle contraction. cGMP which acts as secondary messenger works on the action of acetylcholine, increase in flow of Ca2+into muscle fibres and hence causes muscle relaxation. There is no role of sodium in hormonal action.
Question2: Feeling the tremors of an earthquake a scared resident of seventh floor of a multistoried building starts climbing down the stairs rapidly. Which hormone initiated this action? [CBSE PMT’2007]
(a) Adrenaline
(b) Glucagon
(c) Gastrin
(d) Thyroxine
It is commonly called as ‘emergency hormone’ or 3F-hormone (for fear, fight and flight). Its secretion is regulated by SNS, and not by pituitary as in case of adrenal cortex. It stimulates sweating, heart beat and breathing rate. It causes the dilation of coronary artery (supplying blood to the heart muscles), bronchioles (for increasing inspiratory volume) and pupil (for better vision).
Question3: The blood calcium level is lowered by the deficiency of [CBSE PMT’2008]
(a) Parathormone
(b) Thyroxine
(c) Both calcitonin and parathormone
(d) Calcitonin
Answer: a
A peptide hormone secreted by the parathyroid gland in response to low levels of calcium in the blood. It acts to maintain normal blood levels of calcium by increasing the number of osteoclasts, which break down the bone matrix and release calcium into the blood. It also increases the reabsorption of calcium and magnesium ion in the kidney tubules so that their concentration is maintained in the blood.
Get your questions answered by the expert for free
You will get reply from our expert in sometime.
We will notify you when Our expert answers your question. To View your Question