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 wide QRS complexes in lead V1 indicates LBBB. 2nd degree AV block, Mobitz II is suggested by the two fixed PR intervals prior to the nonconducted P wave. The location of the block is most likely in the right...

The 3 rules of "classic AV Wenckebach" are: 1. decreasing RR intervals until pause; 2. the pause is less than preceding 2 RR intervals; and 3. the RR interval after the pause is greater than the RR interval just prior...

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....