Illustrate the structure and function of two major body systems and how they interrelate.

Topics: Heart, Blood, Respiratory system Pages: 2 (440 words) Published: February 25, 2014
BTEC Health and Social Care Level 2
Unit 7

P2 : Illustrate the structure and function of two major body systems and how they interrelate.


The two major body systems:
1. Circulatory system:
The circulatory system is composed of: *the heart,which is an organ made up of cardiac muscle with four chambers(left and right ventricles; left and right atrium or auricle); the heart is a pumping mechanism that services two branches of transport: -the pulmonary circulation that carry blood from the heart to the lungs and back from the lungs to the heart. -the systemic circulation that carries blood from the heart to the rest of the body and back from the rest of the body to the heart;

*blood, which is made up of :
-plasma: a yellowish fluid part of blood in which other blood components are suspended; -red blood cells: oval or disc-shaped cells that circulate in the blood and that contain haemoglobin to carry oxygen; -white blood cells(cells that circulate in the blood and that help fight infection) and platelets(disc-shaped blood elements that help in blood clothing)

* blood vessels that include veins, arteries and capillaries.

2. Respiratory system:
The respiratory system is composed of:
the "nose" where inhalation take place through the nostrils. the "throat" or pharynx, is the junction between the nasal cavity and the mouth. the "larynx", is the “air’s pathway” at the bottom of the "pharynx"; its entrance is covered by the epiglottis that stops food from going into the lungs when we swallow.It is a short tube that contains a pair of vocal cords that vibrate to make sounds. the "trachea", is a sort of windpipe that extends downward and divides at its bottom end into two left and right air tube called "bronchi". the bronchi(bronchus for singular), are air tubes that connect to the "lungs" and that branch into smaller...
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