SARS-COV-2, the virus that causes COVID-19, infects alveolar cells in the lungs by binding a receptor on the lung cell’s surface known as ACE2.  Some populations are more prone to severe effects from COVID-19.  These include the elderly, and those who are immunocompromised, diabetic, have a chronic lung disease such as asthma, or have heart disease.  However, there are currently NO populations that are immune to developing severe complications as young and otherwise healthy individuals have ended up on ventilators and dead.  We do not know all of the reasons for this.  One may be that some individuals have mutations in the gene that makes ACE2 receptors, changing the shape of the receptor slightly.   The change in shape can either make SARS-CoV-2 better able to bind the cell (thus making it easier to infect), or it can make it more difficult to bind the cell (thus making it harder to infect).  Another possible explanation that has been proposed is that the damage caused by the virus affects the lung’s ability to produce surfactant or the ability of surfactant to do its job.  This is a multi-part question 1. Describe what surfactant is and discuss it’s role in the lungs 2. Name the cell type that produces surfactant and where that cell type is found 3. Discuss why insufficient levels of functioning surfactant would be more likely to cause severe respiratory distress for sufferers of COVID-19

Which of these happen during the follicular phase?  Select ALL that apply:

Which nutrient must be absorbed through the lymphatic system due to its large size even after chemical digestion?

If estrogen is exerting positive feedback on the hypothalamus, which of the following would occur?  

Which of these would not normally leave the blood during filtration?

Substances move from the renal tubule to the peritubular capillary during which process?

In digital imaging, kVp selection has an effect on:PenetrabilityImage contrastPhoton energy

If blood pressure is dangerously high, GFR will be regulated by ________________ mechanisms, and GFR will __________________.

A Memory Cytotoxic T cell needs to be activated by a Plasma cell before it can respond to an invading microorganism

Match each digestive process with an organ in which it occurs: