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external opening of the rectum, part of excretory system, controls the expulsion of feces and waste
Three difference types of muscle (smooth, skeletal, cardiac), voluntary movements, involuntary movements, and in the heart
large flat muscle that allows for breathing by contracting and expanding and changing the volume of the chest cavity
continues mechanical digestion of food with contractions of smooth muscle, contains mucus, hydrochloric aced and enzyme pepsin
excrete waste, filter blood, and regulate the pH levels of the blood, remove urine and water from body
is a portion of the descending aorta that carries oxygenated blood to bottom part of the body
barrier of an organ, lubricated surface, allow two sets of organs to move vigorously without wearing each other away
blood vessels across the heart that branch off the aorta and feed the heart muscle
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