(a) Draw the L.S. of human heart showing the internal structure. Label the parts of the left side of the heart and the blood vessels that enter and leave the chambers of the same side.
(b) What is the significance of the remnants of sinus venosus in the mammalian heart ?

Draw a well labelled diagram of human heart to show its internal structure.

Draw a diagram to show the internal structure of human heart. Label only one heart chamber, any two heart valves and any three other structures.

Draw a diagram of the external structure of human heart (front view) and label the parts.

Describe the internal structure of human heart with the help of a diagram. Show the flow of blood with arrows.

Draw a well labelled diagram of internal structure of human heart.

(a) What are the upper parts of the heart called ? (b) What are the lower parts of the heart called ? (c) What is the name of blood vessels which connect arteries to veins ? (d) (i) Which side of the heart pumps blood into the lungs ? (ii) Which side of the heart pumps blood into entire body (except the lungs ) ?

Oxygen-rich blood from the lungs comes to the thin-walled upper chamber of the heart on the left. The left upper chamber (A) then relaxes. It then contracts and the blood is allowed to enter the next chamber (B), as it expands. When the muscular left lower chamber of heart contracts the blood is pumped out to the body via aorta. Deoxygenated blood reaches from the body to the upper chamber on the right side of heart (C) and it expands. As this part contracts, the corresponding lower chamber (D) dilates. This transfers the blood to right ventricle, which in turn pumps it to the lungs for oxygenated. Which chambers of human heart contain oxygenated blood?

(a)Draw a labelled diagram of internal structure of human heart. (b) What are chordae tendinae? Give their function.

Oxygen-rich blood from the lungs comes to the thin-walled upper chamber of the heart on the left. The left upper chamber (A) then relaxes. It then contracts and the blood is allowed to enter the next chamber (B), as it expands. When the muscular left lower chamber of heart contracts the blood is pumped out to the body via aorta. Deoxygenated blood reaches from the body to the upper chamber on the right side of heart (C) and it expands. As this part contracts, the corresponding lower chamber (D) dilates. This transfers the blood to right ventricle, which in turn pumps it to the lungs for oxygenated. What prevents backflow of blood inside the heart during contraction?

Oxygen-rich blood from the lungs comes to the thin-walled upper chamber of the heart on the left. The left upper chamber (A) then relaxes. It then contracts and the blood is allowed to enter the next chamber (B), as it expands. When the muscular left lower chamber of heart contracts the blood is pumped out to the body via aorta. Deoxygenated blood reaches from the body to the upper chamber on the right side of heart (C) and it expands. As this part contracts, the corresponding lower chamber (D) dilates. This transfers the blood to right ventricle, which in turn pumps it to the lungs for oxygenated. What is the correct route of blood in a human?