1. The cells of the SA node at the top of the heart are known as the pacemaker of the heart because the rate at which these cells send out electrical signals determines the rate at which the entire heart beats (heart rate).
2. septum : The septum is a thick wall of muscle that divides the heart. It separates the left and right sides of the heart.
3.The respiratory and circulatory systems work together to maintain homeostasis. The respiratory system moves gases into and out of the blood. The circulatory system moves blood to all parts of the body.
hope this helps! sorry I couldn't do all of them!
I believe that if your coworker is upset about a disagreement with her supervisor, you should D. listen to her and then return to work.
You shouldn't try to solve her problems, just listen to her and maybe give her advice as to what she should do.
All drugs have one thing in common they are deadly if not used correctly but drugs make you think and do things you do if you where actually present in your mind.
