Human physiology

Summary and Exam Tips for Human Physiology

Human physiology is a subtopic of Option D - Human Physiology, which falls under the subject Biology in the IB DP curriculum. This section covers essential concepts such as human nutrition, digestion, functions of the liver, the heart, hormones and metabolism, and transport of respiratory gases. Essential nutrients, including some fatty acids and amino acids, must be included in the diet as they cannot be synthesized by the body. Malnutrition, obesity, and anorexia are conditions resulting from nutrient imbalances. Digestion involves the regulation of gastric secretions and the role of exocrine glands. The liver's dual blood supply and the heart's cardiac muscle cells are crucial for maintaining physiological functions. Hormones, secreted by endocrine glands, regulate growth, metabolism, and homeostasis. The transport of respiratory gases involves oxygen dissociation curves and the Bohr shift, which explain hemoglobin's oxygen affinity. Understanding these concepts is vital for comprehending how the human body maintains balance and responds to various physiological demands.

Exam Tips

• Understand Essential Nutrients: Focus on the differences between essential and non-essential nutrients. Remember that carbohydrates are not essential as energy can be derived from other sources.

• Malnutrition and Obesity: Be able to explain the causes and effects of malnutrition, obesity, and related diseases like hypertension and type II diabetes. Use real-life examples to illustrate these conditions.

• Digestion and Absorption: Familiarize yourself with the structure and function of the villi in the small intestine. Use mnemonics like MR SLIM to remember key features.

• Heart and Circulatory System: Know the structure and function of cardiac muscle cells and heart valves. Practice mapping the cardiac cycle to an ECG trace for better understanding.

• Hormones and Metabolism: Differentiate between steroid and peptide hormones, and understand their mechanisms of action. Use mnemonics like MARGE to remember pituitary hormone functions.

• Respiratory Gases: Study the oxygen dissociation curve and the Bohr shift to understand hemoglobin's role in oxygen transport. Relate these concepts to real-world scenarios like exercise and high-altitude adaptation.

By focusing on these key areas and using mnemonics and real-life examples, you'll be well-prepared for your exams in human physiology.