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.
How does blood flow through the heart? Blood flows through your heart and lungs in four steps: The right atrium receives oxygen-poor blood from the body and pumps it to the right ventricle through the tricuspid valve. The right ventricle pumps the oxygen-poor blood to the lungs through the pulmonary valve.