Question

The waste products produced in man, which need excretion are

• A. Carbon dioxide
• B. Urea and salts
• C. Excess of water
• D. All of the above

Answer 1

The correct option is D All of the above

Human waste is any substance that our body does not need to maintain homeostasis. Excretion is the process of removing these unwanted products through either the skin, urinary system, respiratory system or gastrointestinal system. The primary organs involved in waste removal are liver, kidneys, lungs, intestines and skin. Catabolism is the breaking down of large molecules into smaller ones for use by your body. Example protein is catabolized and produces nitrogen based waste. This waste product is in the form of ammonia, which can be very toxic. Liver converts it to urea, which is excreted in urine. Waste products released in the process of other types of catabolism are removed from our body through the skin, kidneys, lungs and intestines. Metabolic waste is produced when a cell uses oxygen and nutrients (usually glucose and fats) to create energy. A waste product resulting from this activity that must be expelled to prevent our body from becoming to acidic is carbon dioxide, which is exhaled via lungs. Water and heat are also produced, both of which when they’re in excess, heat will be excreted through the skin (vasodilation of blood vessels) and water is discharged by way of the skin, urinary, respiratory or gastrointestinal systems.