Tag: bio-chemistry

Quizzes (82) Questions (1918)

Questions Related to bio-chemistry

Multiple choice bio-chemistry immunology innate and acquired immunity body fluids and immune responses immunity and immune system

In the inflammatory response, the absence of which one of the following would prevent all the others from happening?

  1. Release of histamine

  2. Dilatation of arterioles

  3. Increased population of phagocytes in the area

  4. Increased permeability of blood vessels
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Histamine, biologically active substance found in a great variety of living organisms. It is distributed widely. The effect histamine has on blood vessels is crucial to its role in the immune response, which is most clearly observed in inflammation i.e., the local reaction of bodily tissues to injury caused by physical damage, infection, or allergic reaction. Injured tissue mast cells  release histamine, causing the surrounding blood vessels to dilate and increase in permeability. This allows fluid and cells of the immune system, such as leukocytes (white blood cells) and blood plasma proteins, to leak from the bloodstream through the vessel walls and migrate to the site of tissue injury or infection, where they begin to fight the infection and nourish and heal the injured tissues..


So, the correct option is 'Option A'.

Multiple choice bio-chemistry transportation in plants and circulation in animals role of blood in transport function of blood blood and lymph

Select the correct option:

Read the following statements and select the correct option:
(i) Blood cells secrete fibres of structural proteins called collagen and elastin.
(ii) Neuroglial cells protect and support the nephrons.
(iii) Osteocytes are present in spaces called lacunae.
(iv) Straited muscle fibres are bundled together in a parallel fashion.
(v) Biceps are involuntary and striated

  1. Statements (iii) and (iv) are incorrect

  2. Statement (ii) and (iv) are incorrect

  3. Statement (i) and (iii) are incorrect

  4. Statement (i), (ii) and (v) are incorrect
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The structural proteins collagen and elastin are present in white collagen fibres and yellow elastic fibres respectively, which are connective tissue fibres. Neuroglial cells are specialised cells found in the brain and spinal cord supporting the neurons and their firbres. The muscles of biceps are voluntary and striated.

Multiple choice bio-chemistry transportation in plants and circulation in animals role of blood in transport function of blood blood and lymph

Most carbon dioxide in blood is in the form of

  1. carbon dioxide

  2. carbonic acid

  3. carbon monoxide

  4. hydrogencarbonate
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Carbon dioxide is transported in the blood from the tissue to the lungs in three ways: (i) dissolved in solution; (ii) buffered with bicarbonate and (iii) bound to proteins, particularly haemoglobin. Majority of the carbon dioxide in the blood is carried by means of a bicarbonate buffer system. So, the correct option is 'hydrogen carbonate'.

Multiple choice bio-chemistry human body and organ system role of blood in transport function of blood blood and lymph body fluid

The function of blood is to

  1. Absorb nutrients

  2. Transport gases

  3. Produce food

  4. Both B and C
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Blood performs many important functions within the body. These functions include the supply of oxygen to tissues (bound to hemoglobin, which is carried in red cells), the supply of nutrients such as glucose, amino acids, and fatty acids (dissolved in the blood or bound to plasma proteins e.g., blood lipids), transport of gases etc.

Therefore, the correct answer is option B.

Multiple choice bio-chemistry human body and organ system role of blood in transport function of blood blood and lymph body fluid

How blood maintains water balance in the body ?

  1. By regulating the pH of the body

  2. By bringing constant exchange of water between circulating blood and tissue fluid

  3. By transporting the excretory material

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Blood maintains water balance in the body by bringing constant exchange of water between circulating blood and tissue fluid. Regulating pH and transportation of excretory material are other functions performed by blood.

Multiple choice bio-chemistry human body and organ system role of blood in transport function of blood blood and lymph body fluid

What fraction of your body is water? 

  1. 1/4

  2. 2/3

  3. 1/2

  4. 1/3
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

About 2/3 of the average human body is water, mostly within the cells. The amount of water in the human body ranges from 50-75%. The average adult human body is 50-65% water, averaging around 57-60%. The percentage of water in infants is much higher, typically around 75-78% water, dropping to 65% by one year of age. Thus, option B is correct.