1. What are the major organs of the circulatory system?2. Where does diffusion occur in the circulatory and respiratory systems? 3. How do the circulatory and respiratory systems work together to transport
gases to all parts of the body?
4. How does the excretory system remove vastes from the blood of the
circulatory system?

An athlete swings a ball, connected to the end of a chain, in a horizontal circle. the athlete is able to rotate the ball at the rate of 8.13 rev/s when the length of the chain is 0.600 m. when he increases the length to 0.900 m, he is able to rotate the ball only 6.04 rev/s. (a) which rate of rotation gives the greater speed for the ball? 6.04 rev/s 8.13 rev/s (b) what is the centripetal acceleration of the ball at 8.13 rev/s? m/s2 (c) what is the centripetal acceleration at 6.04 rev/s? m/s2