Topic: Body Transport System Subtopic: The movement of blood through the heart
What makes heart sound like lub?
Answer: The contraction of ventricles is so strong that the blood flows with power turning the chamber valves close, This makes the 'lub' sound.
- What are varicose veins?
- What is job of red blood cells?
- What is disadvantage of self-pollination?
- How does tar damage lungs?
- How are xylem and phloem arranged in stem?
- How does water and mineral salts reach xylem vessels?