A narrated animation depicting the origins of cholesterol. Guide questions -- How is cholesterol derived from circulating lipoproteins (the preferred source)? How is cholesterol derived from preformed cholesterol...

An interactive animation depicting steroid synthesis and enzymatic pathways. Guide question - How are steroid hormones classified? University of Cincinnati College of Medicine Reproductive Physiology Modules: Part...

An interactive animation depicting the production of progesterone and estradiol in pregnancy. Guide questions - How are progestins, estrogens and androgens synthesized in the maternal-fetal-placental unit? How does...

An interactive animation that enables the user to see steroid hormones in circulation by body region. Guide questions - Why are plasma proteins important for transport of steroid hormones in the circulation? How are...

Guide questions - What are the major known structural differences between the brains of males and females? What is the role of androgen during fetal and neonatal development on the differentiation of the brain? What are...

Second degree AV block is present; conducted beats are identified by those QRS's that terminate shorter cycles than the junctional escape cycle; i.e., the 3rd and probably the 4th QRS's are captures; the other QRS's are...

The ladder diagram illustrates a Wenckebach type AV block by the increasing PR intervals before the blocked P wave. After the blocked P wave, however, a rev-ed up junctional pacemaker terminates the pause. Note that...

Junctional escapes are passive, protective events whenever the heart rate slows below that of the escape mechanism. In this example of 2nd degree AV block, type I, the escapes occur following the non-conducted P waves....

For those entering the medical field, developing a working knowledge of medical terminology can be a daunting task. Des Moines University provides this short introductory course, which allows the user to develop a...

Where are the P waves??? They are hiding in the T waves as indicated by the arrows. How do we know? The PVC unmasked the sinus P wave, and now it is seen in the pause following the PVC. The PR interval is,...