Solution:
Veins are blood vessels that carry blood towards the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins, both of which carry oxygenated blood to the heart.

Solution:
Sodium bicarbonate is baking soda.

Solution:
The water-soluble vitamins include ascorbic acid (vitamin C), thiamin, riboflavin, niacin, vitamin B6 (pyridoxine, pyridoxal, and pyridoxamine), folacin, vitamin B12, biotin, and pantothenic acid.

Solution:
In the case of a heart attack, the hormone that injected as an emergency measure is Adrenaline. An adrenaline shot can increase the chance that the heart will regain a normal rhythm or restart your heart after a cardiac arrest by directing the flow of blood to the heart.

Solution:
A tendon is a fibrous connective tissue which attaches muscle to bone. Tendons may also attach muscles to structures such as the eyeball.

Solution:
Donors with blood group O, Rh- can donate to recipients with blood types A, B, AB and O (O is the universal donor), because it does not have any antigen, thereby no reaction would occur with the antibody, which may be present in donor's body. Hence, option A is correct.

Solution:
Fertilization in human takes place inside oviduct.