Part A) Describe the major structures contained in the dermis layer of the skin. Please include the major function of these structures as well. Part B) Explain the process of muscle contraction including the substances necessary for contraction to occur. Begin with the impulse from the nervous system.

Beginning in the right atrium of the heart, explain the major anatomical structures that a drop of blood passes through before ending up in the aorta. Make sure to include valves, vessels, and heart chambers in your answer.

Please the letter correlating with the appropriate structure next to its function.

Identify the structure that delivers the oxygenated blood into the kidney at high pressure. _________