Why can signals from the sinoatrial node not pass directly from the atria to the ventricles?

How does the structure of cardiac muscle cells allow the propagation of stimuli through the heart wall?

How have scientific studies contributed to educating the public about “good” cholesterol (HDL), and how does it impact heart health?

What is the dual blood supply to the liver, and how do sinusoids differ from capillaries in the liver’s structure?

What are the causes and consequences of jaundice, and how is it related to liver function?

What nutrients can be stored in excess by the liver, and how does this help regulate metabolism?

How does the liver intercept blood from the gut to regulate nutrient levels?

How do the endoplasmic reticulum and Golgi apparatus in hepatocytes contribute to the production of plasma proteins?

How does the liver convert surplus cholesterol into bile salts?

How is iron transported to the bone marrow to produce hemoglobin in new red blood cells?