Adrenaline, also known as epinephrine, is a hormone produced in our body in stressful situations and plays an important role in the fight-or-flight response.
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Glands of the endocrine system secrete hormones into the blood.
The heart is the central pump of the cardiovascular system beating several billion times over our lifetime.
The withdrawal reflex is a spinal reflex that ensures moving away from potentially damaging stimuli.
The cause of a heart attack is the blockage of a coronary artery. It is one the most common causes of death.
The skin is the soft outer covering of our body, its three layers are the epidermis, the dermis and the hypodermis.
The urinary system serves for the removal of harmful and useless materials from the body.
The central nervous system consists of the brain and the spinal cord, the peripheral nervous system consists of nerves and ganglia.