Question

13. Which statement correctly describes the human heart? A. It has three chambers, and pumps blood directly into veins. B. It has two chambers, and it is composed of cardiac muscle. C. It has three chambers, and it is composed of cardiac muscle. D. It has four chambers, and pumps blood directly into arteries. 14. An individual who has had chicken pox rarely gets this disease again. This situation is an example of A. biological control B. negative feedback C, immunity D. metamorphosis 15. The nervous system is most directly involved in A. production of blood cells B. stimulation of rapid growth movement C. elimination of body wastes D. initiation of muscle

Answer 1

Number 13 is D the heart has 4 chambers and pumps blood to the arteries and number 14 us C

Answer 2

13. D ( The left atria and ventricle and the right atria and ventricle)

14. C

15.D (With signals coming from the brain, the nervous system would most likely influence your muscular movement)