How is the respiratory system similar to the digestive or muscular system in humans.

Explanation:

When your blood circulates through your digestive system, for example, it picks up nutrients your body absorbed from your last meal. Your blood also carries oxygen inhaled by the lungs.

The human body uses food and liquids for energy, growth, maintenance and repair. Before it can use food and liquids for these purposes, it must go through a process called digestion, which is carried out by the digestive system. The digestive system consists of the following organs: Mouth, salivary glands, oesophagus, liver, gall bladder, pancreas, stomach, large and small intestines, duodenum, rectum and the anus.

Avian digestive system diagram

The process of digestion begins when a bite of food is taken. The teeth are then used to chew the food breaking it down into smaller and softer pieces. The food is also lubricated at this stage in the process by saliva produced in the salivary glands. Then, when the food is ready to be swallowed, a flap called the epiglottis blocks off the entrance to the windpipe, the soft palate rises to stop food entering the nasal cavity, and the food passes down the oesophagus, in a series of peristaltic waves, until it reaches the stomach, ready for the next stage of digestion.

The mouth of birds is distinctly different from humans. They have no teeth and their jaws are covered by a beak, which is in different forms depending on the bird. Birds, unlike humans, do not masticate or chew their food, as this is accomplished by the gizzard. The oesophagus of birds is large in diameter. Swallowing is accomplished

Explanation:

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