The heart is a muscular organ located in the chest, slightly left of center. It is divided into four chambers - two upper auricles and two lower ventricles. The auricles fill with blood and the ventricles pump it out. There are four valves that help direct the flow of blood - the mitral and tricuspid valves between the auricles and ventricles, and the aortic and pulmonary valves in the arteries leaving the heart. The heart contracts and relaxes in systole and diastole to pump blood around the body via the circulatory system, with the left side pumping oxygenated blood through the greater circulation to the body and the right side pumping deoxygenated blood to the lungs through
The heart is a muscular organ located in the chest, slightly left of center. It is divided into four chambers - two upper auricles and two lower ventricles. The auricles fill with blood and the ventricles pump it out. There are four valves that help direct the flow of blood - the mitral and tricuspid valves between the auricles and ventricles, and the aortic and pulmonary valves in the arteries leaving the heart. The heart contracts and relaxes in systole and diastole to pump blood around the body via the circulatory system, with the left side pumping oxygenated blood through the greater circulation to the body and the right side pumping deoxygenated blood to the lungs through
5. Com són els ossos
1. Llargs
Fèmur
Húmer
Són ossos que tenen forma cilÃndrica,
amb engruiximents arrodonits als extrems.
6. Com són els ossos
2. Curts
Són ossos petits i, normalment, amb
forma de cub.
Ròtula
Vèrtebra
7. Com són els ossos
3. Plans
Solen formar cavitats que serveixen per protegir certs òrgans
delicats del cos. Són ossos plans els del crani, que protegeixen
el cervell.