Which of the following statements is correct?

  • A
    Open circulatory system is present in arthropods and molluscs.
  • B
    Annelids and chordates have a closed type of circulatory system.
  • C
    During a cardiac cycle,each ventricle pumps out approximately $70 \ ml$ of blood,which is called the stroke volume.
  • D
    All of the above are correct.

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Intracellular fluid and extracellular fluid constitute what percentage of total body weight,respectively?

Describe the events in the cardiac cycle. Explain 'double circulation'.

Consider the following four statements regarding the human circulatory system:
$(a)$ Arteries have thick walls and a narrower lumen compared to veins.
$(b)$ Angina is a sudden chest pain.
$(c)$ In the $ABO$ blood grouping system,a person with blood group $AB$ can donate blood to anyone.
$(d)$ Calcium ions play a significant role in blood clotting.
Which two of the above statements are correct?

Which of the following statements is correct regarding the composition of blood and lymph?

In normal humans,the time taken for normal blood clotting is:

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