Tag: transportation in living organisms

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Questions Related to transportation in living organisms

Multiple choice evs transportation in living organisms circulatory system and organs basics of blood and heart circulatory system

Iter (Aqueduct of Sylvius) is found between

  1. Third and fourth ventricles

  2. Two lateral ventricles

  3. Lateral ventricles and third ventricle

  4. Rhinocoel and lateral ventricles
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The cerebral aqueduct, or Iter, is a narrow channel that connects the third ventricle to the fourth ventricle in the brain, allowing cerebrospinal fluid to flow between them.

Multiple choice evs transportation in living organisms circulatory system and organs basics of blood and heart circulatory system

Choose the correct answer from the alternatives given.
The heart sound dup is produced when:

  1. mitral valve is opened

  2. mitral valve is closed

  3. tricuspid valve is opened

  4. semilunar valve at the base of aorta gets closed
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In a healthy individual, there are two normal heart sounds called lub and dub. Lub is the first heart sound. It is associated with the closure of the tricuspid and bicuspid valves at the beginning of systole. The second heart sound dub is associated with the closure of the semilunar valves at the beginning of diastole.

So, the correct option is 'semilunar valve at the base of aorta gets closed'.

Multiple choice evs transportation in living organisms circulatory system and organs basics of blood and heart circulatory system

Choose the correct answer from the alternatives given.
Blood enters the heart because muscles of:

  1. atria relax

  2. ventricles relax

  3. atria contract

  4. ventricles contract
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Human blood passes from the inferior vena cava into the diastolic right atrium of the heart because of a pressure differential between the atrium and the vena cava. This negative pressure gradient is created by atrial diastole and pulls blood to the atrium which is then pumped to the ventricles by contraction.

So, the correct answer is atria relax.

Multiple choice evs transportation in living organisms circulatory system and organs basics of blood and heart circulatory system

Choose the correct answer from the alternatives given.
In normal heart action:

  1. right atrium and ventricle contract, followed by the contraction of the left atrium and ventricle

  2. two atria contract together, then the two ventricles contract together

  3. right atrium and left ventricle contract, followed by the contraction of the left atrium and right ventricle

  4. all four chambers of the heart contract and then relax simultaneously
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Due to one complete cardiac cycle, the two atria contract during the first 0.1 seconds, followed by ventricular systole for 0.3 seconds and finally joint diastole for 0.4 seconds. 

So, the correct option is 'Two atria contract together, then the two ventricles contract together'.

Multiple choice evs transportation in living organisms blood in humans circulatory system - blood basics of blood and heart

Which of the following statements is true about RBCs in humans?

  1. They carry about 20-25 per cent of $CO _{2}$.
  2. They transport 99.5 per cent of $O _{2}$.

  3. They transport about 80 per cent oxygen only and the rest 20 per cent of it is transported in dissolved state in blood-plasma.
  4. They do not carry $CO _{2}$ at all.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Nearly 20-25% of $CO _{2}$ is transported by RBCs whereas 70% of it is carried as bicarbonate in plasma. About 7% of $CO _{2}$ is carried in a dissolved state through plasma. About 97% of $O _{2}$ is carried by RBCs in the blood. About 3% of $O _{2}$ Is transported in a dissolved state through the plasma.

So, the correct answer is 'They carry about 20-25 per cent of 
CO2CO2'

Multiple choice evs transportation in living organisms blood in humans circulatory system - blood basics of blood and heart

Critical count of Platelete is _______________

  1. $4\times 10^4 /mm^3$
  2. $1 \ lakh /mm^3$
  3. $2 \ lakh /mm^3$
  4. $4 \ lakh /mm^3$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Platelet count is the number of platelets in the blood. The normal platelet count ranges from 2- 5 lakh cells/mm$^3$. In disease conditions like dengue, the platelet count is decreased below the average value. This condition is called thrombocytopenia. If platelet count drops below 1 lakh /mm$^3$, it is considered as critical platelet count it denotes that person is at high risk of bleeding.
So, the correct answer is 'Option B'.
Multiple choice evs transportation in living organisms blood in humans circulatory system - blood basics of blood and heart

During heat shock to the bacterium , the temperature used for giving thermal shock is:

  1. $82^oC$
  2. $109^oC$

  3. Liquid nitrogen
  4. $42^oC$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Heat Shock is given to bacteria for transformation that alters the membrane fluidity. The increase in temperature creates pores in the bacterial plasma membrane and allow plasmid DNA to enter the bacterial DNA. For the heat shock, the DNA-bacteria mixture is put into a 42C to 37C water bath. 

Multiple choice evs transportation in living organisms blood in humans circulatory system - blood basics of blood and heart

TLC of human blood is about?

  1. $5000 - 6000$ per ml of blood
  2. $5000 - 11000$ per ml of blood
  3. $5000 - 11000$ per cubic mm of blood
  4. $2000 - 6000$ per cubic mm of blood
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
TLC or the total leukocyte count is calculated by a laboratory test. It calculates the number of cells present in a fixed volume of blood (or area). The standard TLC of blood in humans usually ranges from 4,000 and 11,000 cells in every microliter of blood. This value can vary from one race to another.
So, the correct answer is '5000−11000 per ml of blood'.
Multiple choice evs transportation in living organisms blood in humans circulatory system - blood basics of blood and heart

Choose the correct answer from the four options given.
The lifespan of RBC is?

  1. $100$ days
  2. $120$ days
  3. $110$ days
  4. $130$ days
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In human physiology, mature red blood cells (erythrocytes) have an average lifespan of approximately 120 days in circulation before they are destroyed and recycled by macrophages in the spleen and liver.