Introduction to Human Anatomy and Physiology

This section introduces the foundational concepts of human anatomy and physiology, outlining the scope, history, and organizational structure of the human body. Understanding these basics is essential for further study in the field.

Course Structure and Resources

• Instructor: Dr. Mark MacDougall

• Contact: Provided email and office location for student support.

• Assessment Breakdown:

• Resources: Lecture notes and lab information are posted on Moodle. Textbook: OpenStax Anatomy and Physiology, 2nd edition.

Course Learning Objectives

• Identify the types of cells and tissues that make up the human body.

• Describe the various organs and organ systems of the body.

• Explain how cells, tissues, and organ systems function and interact.

What is Anatomy?

Anatomy is the study of the body's many structures. The term comes from the Greek root meaning "to cut apart," reflecting the historical practice of dissection to study body parts.

• Scope: Includes all physical structures, from cells to organ systems.

• Application: Used in medicine, biology, and allied health sciences.

History of Human Anatomy

Ancient and Early History

• Evidence of anatomical study dates back to the Stone Age, with trepanation (skull surgery) found in Neolithic remains.

• Ancient Egyptians produced the earliest written anatomical records (~1600 BCE).

• Ancient Greeks advanced the field, with Hippocrates and his followers making significant contributions.

Middle Ages to Renaissance

• Andreas Vesalius (1514–1564) is considered the founder of modern human anatomy, publishing detailed anatomical drawings.

• During the Renaissance, dissection of human cadavers became more accepted, leading to rapid advances.

• The invention of the microscope in the 17th century enabled the study of cells and tissues (histology).

Gross vs. Microscopic Anatomy

Human anatomy is traditionally divided into two main branches based on the scale of observation.

• Microscopic Anatomy Subdivisions:

  • Cytology: Study of cells

  • Histology: Study of tissues

Regional vs. Systemic Anatomy

• Regional Anatomy: Focuses on muscles, nerves, blood vessels, etc., in a particular area (e.g., the arm).

• Systemic Anatomy: Focuses on organ systems (e.g., the digestive system).

Levels of Organization in the Human Body

The human body is organized hierarchically, from the simplest chemical level to the most complex organismal level. Understanding these levels is crucial for studying structure and function.

1. Chemical Level: Atoms and molecules essential for life (e.g., water, proteins).

2. Cellular Level: Cells are the basic structural and functional units of life.

3. Tissue Level: Groups of similar cells performing a common function (e.g., muscle tissue).

4. Organ Level: Structures composed of two or more tissue types (e.g., heart, liver).

5. Organ System Level: Groups of organs working together (e.g., digestive system).

6. Organismal Level: The complete living being (human).

• Cells: Perform all life functions; specialized cells form tissues.

• Stem Cells: Undifferentiated cells that can become specialized.

• Organs: Composed of multiple tissue types; perform specific functions.

• Example: Skeletal muscles attach to bones for movement and generate heat as a secondary function.

What is Physiology?

Physiology is the scientific study of the functions and mechanisms in a living system. In human physiology, the focus is on how body structures work together to support life.

• Difference from Anatomy: Anatomy is about structure; physiology is about function.

• Example: Studying how the heart pumps blood (physiology) versus the structure of the heart (anatomy).