Which one of the following hormones is essential for the uptake of glucose by cells in the human body?
- A.GH
- B.TSH
- C.Insulin
- D.Cortisol
Correct answer
Explanation
The correct answer is C, Insulin. Insulin lets glucose leave the blood and enter body cells, especially muscle and fat cells, and so it lowers the blood sugar level. It is made by the beta cells of the islets of Langerhans in the pancreas and released after a meal. Insulin also helps the liver and muscles store extra glucose as glycogen. When the body makes too little insulin, or its cells cannot respond to it, glucose stays in the blood and causes diabetes mellitus. Glucagon, from the alpha cells of the same islets, does the opposite and raises blood sugar. Option A is wrong because GH, the growth hormone of the pituitary gland, controls growth and tends to raise blood sugar. Option B is wrong because TSH, the thyroid-stimulating hormone, makes the thyroid gland release its hormones. Option D is wrong because cortisol, from the adrenal cortex, is a stress hormone that raises blood glucose. Exam tip: insulin from the beta cells lowers blood sugar; glucagon from the alpha cells raises it.
Practice Questions
View allIn the joining of railway tracks, iron oxide is made to react with
- A.Aluminium
- B.Zinc
- C.Copper
- D.Tin
Show answer
Railway tracks are joined by the thermite process, in which aluminium powder reduces iron oxide to molten iron. The reaction is Fe₂O₃ + 2Al → 2Fe + Al₂O₃.
Read the full explanation →If atomic number of an element is 11, the correct name, symbol and valency are :
- A.Lithium, Li, 1
- B.Magnesium, Mg, 2
- C.Boron, B, 3
- D.Sodium, Na, 1
Show answer
The element with atomic number 11 is sodium, and with one electron in its outermost shell its valency is 1.
Read the full explanation →A car of mass 800 kg is travelling at a speed of 40 km/h on a straight road. A force of 1000 N is applied on it in the direction of its velocity for 12 s. Which one among the following is the final speed of the car?
- A.55 km/h
- B.60 km/h
- C.94 km/h
- D.104 km/h
Show answer
The force gives the car an extra 15 m/s, which is 54 km/h, and 40 + 54 = 94 km/h. By Newton's second law, acceleration a = F/m = 1000 N ÷ 800 kg = 1.25 m/s².
Read the full explanation →Consider the electromagnetic radiations having wavelengths 200 nm, 500 nm and 1000 nm. Which wavelength(s) of the following can make visual sensation to a human eye?
- A.200 nm and 500 nm
- B.500 nm and 1000 nm
- C.500 nm only
- D.200 nm and 1000 nm
Show answer
The human eye responds only to visible light, which lies roughly between 400 nm (violet) and 700 nm (red), and 500 nm is the only one of the three values in that range.
Read the full explanation →Bright light is found to emit from photographer's flashgun. This brightness is due to the presence of which one of the following noble gases?
- A.Argon
- B.Xenon
- C.Neon
- D.Helium
Show answer
A photographer's flash tube is filled with xenon, which gives an intense burst of white light when a high-voltage spark passes through it.
Read the full explanation →