Thursday, October 22, 2009

The Cardiovascular System



The Cardiovascular System includes: Your heart, blood (Red and White Blood Cells), The Circulatory System, and The Lymphaticn System. The main functions of the Cardiovascular System are to transport nutrients, oxygen, and hormones to cells inside the body, remove metabolic wastes, protect the body, and the regulation of body temperature, fluid pH, and the water content of the cells. The Cardiovascular System protects the body through white blood cells, antibodies, and complement proteins that help to circulate the blood and to defend the body from microbes and toxins.











The Heart











There are four cavities inside of the heart that fills with blood. Two of the cavities are called the atria, and the other two are known as the ventricles.The atria make up the curve part at the top of the heart. The ventricles form the pointed bottom of the heart. The left side of the heart consists of one atria and one ventricle and the right side consists of the other two.














Blood




Blood transports oxygen from the lungs to the body tissues and transports waste systems, nutrients, hormones, and enzymes. The blood also protects organisms and regulates blod clotting, body temperature, acid-bases balance, and electrolytes.



































































Platelets in the Blood







Blood Platelets are the odd-shaped, colorless bodies present in blood. Their sticky surface allows them to form clots to stop bleeding.

















The Lymphatic System


The lymphatic system is important in immunity. The lymphatic system is made up of vessels that help in order to maintain the balance of fluids in the cells. The cardiovascular system is supported by the lymphatic sysem.















Video Link
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Tuesday, October 13, 2009

The Skeletal System





The skeletal system has many important purposes. It provides our body's shape and form, it protects our organs, stores minerals such as calcium,iron and bone marrow, and it allows bodily movement. The skeletal system has 206 bones in it that form the framework in which the organs and the softer tissues are attached. There are two distinct parts of the skeletal system. They are: The axial and the appendicular system. The axial skeleton is made of bones that form the axis of the body,support and protect the organs of the head and neck (the skull, sternum, ribs, and vertebral column). The appendicular skeleton is made of bones that anchor the appendages to the axial skeleton (The upper and lower extremeties, shoulder girdle, and the pelvic girdle).
The four types of bones in the body, include: Long bones, Short bones, Flat bones, and Irregular bones. Long bones are longer than wide and work as levers. (The bones in the Upper and Lower extremeties are Long bones.) Short bones tend to be shaped like cubes, short, and mostly found in the wrists and in the ankles. Flat bones have broad surfaces that protect organs and the attachment of muscles. (Flat bones include the ribs, the cranial bones, and the bones located in the shoulder girdle.) Irregular bones are the bones that do not fall into any category and vary in shapes, sizes, and surfaced features. ( There are a few bones and the skull and the bones of the vertebrae are Irregular Bones.)



LONG BONES FLAT BONES IRREGULAR BONES







There are many joints in the skeletal system. These joints include the ball-and-socket joints, ellipsoidal joints, pivotal joints, and hinge joints.


BALL-SOCKET JOINTS PIVOT JOINTS HINGE JOINTS


ELLIPSOIDAL JOINTS


This is a video showing the functions of the skeletal system.
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