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.

What is the name of the body part at number 3?  

Which part of the heart distributes oxygenated blood to the body? 

T cells are lymphocytes that secrete antibodies and B cells lymphocytes that directly attack antigens

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. 

The following is part of what type of tissue?

Protein hormones cannot cross cell membranes and bind to surface receptor were they bind to surface receptor, a signal transduction to produce a chainreaction relays signal from outside. Were as steroid hormones are fat-soluble hormones that can cross cell membranes and bind to receptors inside target cell to turn specific genes on or off

What is the mane of the body part at number 6?  

Which chamber of the heart receives the deoxygenated blood from the systemic system first?

  In this diagram what is at number 1.