Arteriolar resistance is influenced by both local and systemic control mechanisms. Which of the following statements are true?
1) Local control of arteriolar resistance matches tissue blood flow to the metabolic needs of the tissue.
2) Sympathetic reflexes mediated by the CNS maintain mean arterial pressure and determine blood distribution to various tissues to meet homeostatic needs, such as temperature regulation.
3) Hormones, particularly those that regulate salt and water excretion by the kidneys, influence blood pressure by acting directly on the arterioles and by altering autonomic reflex control.