3. Systole occurs when the:Semilunar valves open and closeHeart tissue is relaxingAortic valves open and closeAtrioventricular valves open and closeHeart tissue is contracting5. During countercurrent...

3. Systole occurs when the:Semilunar valves open and closeHeart tissue is relaxingAortic valves open and closeAtrioventricular valves open and closeHeart tissue is contracting5. During countercurrent flow which direction does water and the blood flow?Water flows out of the gills while blood flows in the opposite direction Water flows inward across the gills while blood flows in the same direction Water flows across the surface of the lungs while blood flows in the opposite direction Water flows in through the gills while blood flows in the opposite direction Water flows out of the gills while blood flows in the same direction11. Which of the following is not a correct pairing of a muscle and location?Biceps brachii-upper arm Deltoid-lower leg Latissimus dorsi-back Quadriceps femoris-upper legPectoralis major-chest