G11_PLANT AND ANIMALS ORGAN SYSTEM AND THEIR FUNCTIONS

Plants and Animal Organ Systems and Their Functions

• Overview of organ systems in animals and plants.

Levels of Organization

• Hierarchy of biological organization:

  • Atoms

  • Molecules

  • Organelles

  • Cells

  • Tissues

  • Organs

  • Organ Systems

  • Organisms

  • Populations

  • Ecosystems

Cells: The Basic Unit of Life

• Cells are the smallest unit of an organism, specialized for specific functions.

• Specialized Cells examples:

  • Blood cells: flexible for narrow vessels.

  • Leaf cells: facilitate photosynthesis.

  • Root cells: absorb water and nutrients.

  • Nerve cells: transmit information.

Tissues and Their Functions

• Definition: A tissue is a group of similar specialized cells working together.

• Types of Tissue in Animals:

  • Epithelial Tissue: Protective layer.

  • Muscle Tissue: Facilitates movement.

  • Nerve Tissue: Transmits messages.

  • Connective Tissue: Provides support and structure.

Organ Structure and Function

• Definition: An organ consists of different tissues functioning together.

• Examples:

  • Brain: Combination of nerve, connective, and epithelial tissues.

  • Heart: Comprised of muscle, nerve, connective, and epithelial tissues.

  • Plant Organs: Roots, stems, and leaves contain various tissues.

Organ Systems

• Definition: A group of organs working together to perform a major function.

• Animal Organ Systems include:

  • Nervous system

  • Muscular system

• Plant Organ Systems:

  • Shoot system (leaves, stems)

  • Root system (roots)

Organism

• Definition: A complete living thing dependent on cells and systems for life.

• All components (cells, tissues, organs, systems) work synergistically for survival.

Types of Plant Tissues

• Parenchyma: Most abundant, least differentiated cells.

• Collenchyma: Provides support.

• Sclerenchyma: Tough, reinforced cell walls.

Specialized Plant Tissues

• Dermal Tissue: Protects plant surfaces.

• Vascular Tissue: Conducts water and nutrients.

  • Xylem: Conducts water.

  • Phloem: Transports sugars.

• Ground Tissue: All remaining tissue types in plants.

Plant Growth

• Meristems: Regions that contain embryonic stem cells responsible for growth. Found at tips of roots and shoots.

Stomatal Function

• Function: Allow gas exchange, guarded by guard cells.

  • Role in Photosynthesis: Intake of CO2 and release of O2 and H2O.

Energy Production and Transport in Plants

• Photosynthesis: Sugar produced in leaves.

  • Mineral Transport: Roots absorb water/minerals.

  • Mycorrhizae: Helps in nutrient absorption.

Plant Hormones

• Types:

  • Auxin: Promotes growth, cell division, and root development.

  • Cytokinins: Encourage cell division and delay leaf aging.

  • Gibberellins: Stimulate stem elongation and seed germination.

  • Absicic Acid: Inhibits growth and plays a role in stress responses.

Reproductive Systems

• Pollination: Transfer of pollen for fertilization.

• Double Fertilization: Ensures endosperm development in seeds.

Organ Systems in Animals

Digestive System

• Components:

  • Mouth

  • Esophagus

  • Stomach

  • Small Intestine

  • Large Intestine

  • Pancreas

  • Liver

• Function: Breakdown and absorption of food.

Respiratory System

• Components:

  • Nasal Passage

  • Trachea

  • Bronchi

  • Lungs

• Function: Gas exchange (oxygen and carbon dioxide).

Nervous System

• Key Structures:

  • Neurons

  • Axons

  • Dendrites

• Function: Communication and regulation of body processes.

Circulatory System

• Pathway: Blood flow through heart and vessels, oxygen transport throughout body.

• Function: Supply body with nutrients and oxygen, remove waste products.

Excretory System

• Components:

  • Kidneys

  • Nephrons

  • Bladder

• Function: Filters blood, excretes waste, regulates water balance.

Immune System

• Components:

  • Lymph System

  • Leukocytes

  • B and T Cells

• Function: Protects body from pathogens.

Reproductive System

• Components:

  • Male: Testicles, Penis, Glands.

  • Female: Ovaries, Fallopian Tubes, Uterus.

• Function: Reproduce and ensure survival of the species.