In today's lesson, we reviewed the fundamental criteria of living things and looked at the Textbook to see what it had to say about these criteria. We also explored cell respiration and did a class demo where, after some aerobic exercise, we observed our body system respond to the energy requirement of running on the spot.
Our breathing rate increased. Our hearts beat faster. Our muscles began to feel sore.
All living things get energy using biochemical reactions. Many living things on earth get their energy using cell respiration. All human body systems support cells doing cell respiration.
a. Cardiovascular System and Respiratory system deliver Oxygen and remove Carbon dioxide for all cells
b. Digestive system provides glucose
c. Excretory system removes excess water
If muscles do not receive enough Oxygen for cellular respiration then they undergo a fermentation reaction which generates less energy and also generates lactic acid. Lactic acid can persist in muscles and make your muscles sore.
