Lesson 11 — Human Systems Quiz Cheat Sheet

Biology

In one line: Twelve facts across the four systems this quiz tests — heart, lungs, neurons, and gut.

Fast Recall

1Bicuspid (mitral) valve lies between left atrium and left ventricle.

2Cardiac output = heart rate × stroke volume.

3Red blood cells (haemoglobin) transport oxygen.

4Alveoli are the gas exchange site.

5Inspiration: diaphragm contracts and flattens.

6Resting potential is about -70 mV.

7Depolarisation: Na+ rushes in.

8Myelin sheath speeds signal transmission.

9Amylase breaks starch into maltose in the mouth.

10Pepsin works best at pH 2 (stomach).

11Small intestine (villi) is the primary absorption site.

12Sympathetic division drives fight-or-flight.