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Among all of the topics covered in this course up through the first decade of the 21st century, what do you think are the three most important topics and why?  This is a reasoning question, so be sure that your essay response to the prompt explains your reasoning (explains why you think the 3 topics you’ve chosen to write about are most important). A minimum of five paragraphs is required, relying on an opening/introduction that contains a thesis, along with 3 paragraphs providing supporting information, evidence, facts, and analyses of sources, and capped by a concluding or closing paragraph.

The skeletal system is divided into two units: Axial skeleton composed of ribs, spine, and skull and Appendicular skeleton composed of hip, shoulder, and limbs. 

A complete cardiac cycle of the heart consists of the heart filling with blood, diastole (relaxed period), and then pumping out the blood, systole (contraction phase).

What is the name of the body part at number 8?  

Which chamber of the heart receives the oxygenated blood returning from the lungs first?

Kidneys absorb digested nutrients into the bloodstream were Villi and microvilli increase the surface area for nutrient absorption.

Which term is used to define the exchange of gases between blood and air?

What is the energy molecule of the cell?

  In this diagram what is at number 1.

What tissue provides movement to the animal?