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um of blood, called plasma, accounts for what percentage of whole 22. The smallest and human body are commonly blood? a. b. c
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16. d. brain

Cranial cavity is the space that is present in the skull. We know that our brain is present inside the skull.

Heart is located in the chest region. The exact place where it is located is mediastinum. Liver is located above the stomach. Spinal cord is present along the vertebral column.

Thus the only given organ located in the cranial cavity is brain.

17. c. Vertebral

Spinal cord is present in the vertebral cavity. Spinal cord is a long cord like structure which runs along the vertebral column. The cord co-ordinates the nervous system. It is safe guarded in the vertebral cavity of vertebral column.

Thoracic cavity contains lungs, heart etc., abdominal cavity is the region inside stomach while cranial cavity is the region inside skull.

18. c. Product

Here the maltose is product. Because the enzyme salivary amylase is acting upon substrate starch to covert it into the product maltose.

Maltose is the product in the reaction as it is the final output.

19. c. Platelets

The cell fragments in the blood which help in blood clotting are blood platelets. These are also called thrombocytes. Platelets are several blood clotting factors which act at the site of injury and proceeds the blood clotting in several steps.

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