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How Menstruation Works
health.howstuffworks.com/wellness/women/general/menstruation.htm
Menstruation the female reproductive cycle that makes eggs available for fertilization. Learn about menstruation and menstrual cycles at HowStuffWorks.
How Muscles Work
health.howstuffworks.com/human-body/systems/musculoskeletal/muscle.htm
Muscles are your body's engine, and you couldn't do anything without them. Learn about skeletal muscle, smooth muscle, and cardiac muscle and how muscle contraction works.
How Hearing Works
health.howstuffworks.com/mental-health/human-nature/perception/hearing.htm
Hearing is made possible through physical movement, rather than chemical reactions. Learn about hearing and see diagrams explaining the hearing process.
When you have an itch, what is happening under your skin?
health.howstuffworks.com/skin-care/information/anatomy/question600.htm
When you have an itch, what is happening under your skin? And, why does scratching make it go away?
Are all blood types needed for for donation?
health.howstuffworks.com/human-body/systems/circulatory/question593.htm
I would like to donate blood and keep hearing about which blood types are needed most. How do human blood types work?
How Prenatal Testing Works
health.howstuffworks.com/pregnancy-and-parenting/pregnancy/issues/prenatal-testing.htm
During a pregnancy, different kinds of prenatal testing are an important part of the process. See how prenatal testing protects both the mother and child.
What makes your arms, legs and feet fall asleep?
health.howstuffworks.com/human-body/parts/question552.htm
What makes your arms, legs and feet fall asleep? Basically, your nerves go a little haywire when your limbs fall asleep. Learn why.
What happens when pregnant women smoke?
health.howstuffworks.com/pregnancy-and-parenting/pregnancy/issues/question551.htm
Pregnancy and smoking should never be mixed because of the harm it can cause to the developing baby. Learn more about pregnancy and smoking.
How Your Kidneys Work
health.howstuffworks.com/human-body/systems/kidney-urinary/kidney.htm
The kidneys perform several important tasks. Learn about kidney processes and how the kidneys maintain water volume and balance and regulate blood composition.
Can nasal sprays be addictive?
health.howstuffworks.com/mental-health/question546.htm
I can't live without my decongestant spray! How can nasal decongestant sprays be addictive?