1. A. a) In what way do the respiratory and circulatory systems depend on each other? (1 point) b. How does the nervous system affect the circulatory system? (1 point) c) How do the cardiovascular system and the skeletomuscular system interact? (1 point) d) How does the nervous system help the excretory system maintain homeostasis? (1 point) 1.B) How do the thyroid and parathyroid form a feedback loop? (1 point) b) In what way does the endocrine system cause homeostasis? (1 point) 1 C. a) How does a vaccine relate to the virus that it protects against? (1 point) -b) How does a vaccine change the body? (1 point)