Biology : Human Organ Systems III

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_______ are the organs of hearing.

veins

_______ is a tubular structure through which urine is excreted out of the body.

saliva

Blood is returned to the heart from various body parts through blood vessels known as _______.

Ears

Salivary glands secrete a fluid known as _______ which helps in digestion as well as in swallowing of food.

Urethra

_______ is a muscular leaf-like structure helpful in swallowing of food and speaking.

Tongue