The answer is a, medial. Medial means toward the midline (or middle) of the body. The heart is closer to the midline of the body in comparison to the shoulder.
The immune system fights off the pathogen by Leukocytes also known as white blood cells. When a pathogen enters the body the immune system becomes alert to it and sends out sends out the Phagocytes (a type of Leukocytes) which engulfs the pathogens.
Study Unit needs self checks
true
while this may be true second hand smoke is far deadlier then directly smoking they have been mixed with nicotine and chemicals you would find to clean windows with etc such as appliance cleaners etc
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