week 11

• What is the primary function of organs in the human body?


  Each organ, such as the heart, brain, and kidneys, is made up of a collection of cells and tissues performing a specific function vital to the body’s needs.
• How are tissues classified in the human body?


  Tissues are organized groups of similar cells that perform a collective function and are classified into four main types: epithelial, connective, muscle, and nervous tissue.
• What are the four main types of tissues in the human body?

  The four main types of tissues are:

  1. Epithelial Tissue: Forms protective barriers, lines organs, and is involved in secretion and absorption.
  2. Connective Tissue: Provides structure, support, and binding.
  3. Muscle Tissue: Facilitates movement.
  4. Nervous Tissue: Specialized for rapid communication and control.
• What is the function of the cell membrane?


  The cell membrane is a selective barrier that regulates the entry and exit of substances, maintains an electrochemical gradient, and enables cellular communication.
• What role does the nucleus play in a cell?


  The nucleus is the control centre of the cell, housing genetic material (DNA) and coordinating cell activity such as growth, reproduction, and protein synthesis.
• What are mitochondria known for?


  Mitochondria are known as the cell’s powerhouse because they generate ATP, the cell's main energy source, through aerobic respiration.
• What are the types of epithelial tissue?


  The types of epithelial tissue include:

  • Squamous: Thin and flat, found in low-friction areas.
  • Cuboidal: Cube-shaped, often in glands.
  • Columnar: Tall and column-like, with microvilli for absorption or cilia for movement.
• What are the types of connective tissue?


  Types of connective tissue include:

  • Loose Connective Tissue: Provides cushioning and energy storage.
  • Dense Connective Tissue: Offers strength and resistance to tension.
  • Cartilage: Firm yet flexible.
  • Bone: A calcified, rigid tissue supporting and protecting organs.
• What are the three types of muscle tissue?


  The three types of muscle tissue are:

  1. Skeletal Muscle: Voluntary and striated, responsible for body movements.
  2. Cardiac Muscle: Involuntary and found in the heart.
  3. Smooth Muscle: Involuntary and lines organs.
• What are the functions of muscles in the body?

  Muscles facilitate movement, maintain stability and posture, and generate heat for temperature regulation
• What is ATP, and why is it important?


  ATP (Adenosine Triphosphate) is the primary energy currency of the cell, produced in mitochondria, and releases energy for cellular functions.
• What are the two types of respiration in cells?


  The two types of respiration are:

  1. Aerobic Respiration: Efficient ATP production in the presence of oxygen.
  2. Anaerobic Respiration: ATP production without oxygen, which is less efficient and produces lactic acid as a by-product.