Cardiovascular, respiratory and digestive system

The human respiratory system contains – trachea which is the windpipe that starts at the nose and mouth to the bronchi. Bronchus which is a tube that comes from the trachea to the lungs. The lungs have the gas exchange surfaces, bronchiole which is smaller tubes which are inside the lungs and come from the bronchus to the alveoli. The alveoli are tiny air sacs at the end of the bronchioles and this is where gas exchange occurs. Ribs which give a moveable cage and to protect the lungs, the intercostals muscle is what helps the ribcage tpo change volume. The diaphragm work with the intercostals muscle to make ventilation happen.

The digestive system is an organ system which humans can exchange substances with the environment. It contains many parts which have different functions. Digestion breakdown larger molecules into smaller molecules so they are soluble and can get absorbed by the body.

It contains the pancreas and salivary glands which produce digestive juices, the stomach which churns up food and joins it with the digestive juices, liver which produces bile which helps to digest fat. The small intestine digests and absorbs the soluble food and the large intestine absorbs water from food that is undigested and produces faeces.

The similarities between all the systems are that they involve the intake or usage of useable substances and remove the waste products of it.

The link between the digestive system (DS) and respiratory system (RS) are small. The digestion of something does depend on the respiratory system because the digestion involves muscles to contract to break up food so these muscles need oxygen to move. The respiratory system delivers oxygen to it so this is how they are linked.

The link between the Ds and cardiovascular system (CVS) is at the ileum which is at the end of the DS. This is where nutrients are absorbed and they go through the hepatic portal vein to the liver and then to the rest of the CVS.

The link between the CVS and RS is simple, as cardio is the heart and lungs and vasculated means the blood vessels found in the body the air from the environment is pulled into the alveoli which is in the lungs and this is vascular which means it is part of the cardiovascular system. This is where gas exchange occurs – oxygen goes in and carbon dioxide goes out- and then it is the RS which brings in oxygen into the body and removes carbon dioxide.