Biology Lecture Notes

Introduction

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• Video lessons are also available for free.

Importance of the Circulatory System

• The circulatory system fulfills the need for transport in our body.
• Its main function is to deliver oxygen and nutrients to various organs.

Circulatory Fluids

1. Blood

   • The red appearance of blood and its various components such as RBCs, WBCs, and platelets.

2. Tissue Fluid

   • Fluid present in the space between organs.

3. Lymph

   • Flows in organs like lymph nodes and spleen.

Transportation of Blood

• Digestive System: Transport of nutrients
• Respiratory System: Transport of oxygen
• Excretory System: Elimination of waste products
• Endocrine System: Distribution of hormones

Composition of Blood

• Plasma: The liquid part with 92% water
• Cellular Part:
  • RBC: Transport of oxygen
  • WBC: Phagocytosis
  • Platelets: Help in blood clotting

Blood Circulation

• Four chambers of the heart: two atria and two ventricles
• Double circulation: systemic and pulmonary

Blood Pressure

• Importance of systolic and diastolic pressure
• Normal range: 100-140 mmHg systolic and 60-80 mmHg diastolic

Lymph System

• Lymph organs: spleen and tonsils
• Function of lymph: Providing nutrition and removing toxins

Structure of the Heart

• Function of valves between auricles and ventricles
• Description of heart structure via diagram

Summary

• Various functions of blood and lymph and their interrelationship
• Advice to take advantage of free education available