There are many reasons kids' hair might fall out abnormally or excessively. Tinea capitis. The most common cause of hair loss in children is an infection known as tinea capitis. Tinea capitis is a type of ringworm that attacks the hair and causes scaly, ring-like lesions to form.
The right atrium pumps blood through the right atrioventricular (tricuspid) valve to the right ventricle. From the right ventricle, blood flows through the pulmonary valve to the lungs via the pulmonary arteries (deoxygenated blood).In the lungs the blood becomes more red in color as it is oxygenated.Blood returns to the heart via the pulmonary veins (oxygenated blood) to the left atrium.The left atrium pumps blood through the left atrioventricular (bicuspid or mitral) valve to the left ventricle.n the lungs the blood becomes more red in color as it is oxygenated. Blood returns to the heart via the pulmonary veins (oxygenated blood) to the left atrium. The left atrium pumps blood through the left atrioventricular (bicuspid or mitral) valve to the left ventricle.
The blood exchange gases at the lungs' alveoli, and then the blood returns to the heart via pulmonary veins, freshly oxygenated by the alveoli. The pulmonary vein carries the blood to the left atrium, and then the blood is forced into the left ventricle through the mitral valve.lows through the bicuspid valve to the left ventricle. pumped out of the left ventricle through a semi lunar valve into the aorta. branches through series of arteries to all parts of the body. Leaves the body tissues via various veins and re enters the right atrium of the heart via the vena cava.