12.a) Name the blood vessel that brings deoxygenated blood to human heart.
b) Which chamber of human heart receives deoxygenated blood?
c) Explain how deoxygenated blood from this chamber is sent to lungs for oxygenation. (3)
b) Which chamber of human heart receives deoxygenated blood?
c) Explain how deoxygenated blood from this chamber is sent to lungs for oxygenation. (3)
a). Superior and inferior vencava (veins).
Superior vencava carries blood from the organs of the upper body to the heart and the inferior venacava carries the blood from the organs of the lower part of the body to the heart.
b) .Superior and inferior vena cava carry deoxygenated blood from the upper and lower regions of the body respectively and supply the deoxygenated blood to the right auricle of the heart. The right auricle contracts and passes the deoxygenated blood to the right ventricle, through an auriculo-ventricular aperture (tricuspid valve).
c). The deoxygenated blood comes to the right atrium from the whole body, then it moves to the right ventricle. From the right ventricle, the blood goes to the lungs for its oxygenation through the pulmonary artery. It arises from the base of the right ventricle and branches into two pulmonary arteries, one for each lung.
a). Superior and inferior vencava (veins).
Superior vencava carries blood from the organs of the upper body to the heart and the inferior venacava carries the blood from the organs of the lower part of the body to the heart.
b) .Superior and inferior vena cava carry deoxygenated blood from the upper and lower regions of the body respectively and supply the deoxygenated blood to the right auricle of the heart. The right auricle contracts and passes the deoxygenated blood to the right ventricle, through an auriculo-ventricular aperture (tricuspid valve).
c). The deoxygenated blood comes to the right atrium from the whole body, then it moves to the right ventricle. From the right ventricle, the blood goes to the lungs for its oxygenation through the pulmonary artery. It arises from the base of the right ventricle and branches into two pulmonary arteries, one for each lung.
