Transportation

Transportation in Animals and Plants

Nutritional Needs

  • All organisms need food, water, and oxygen for survival.

  • Transport of these substances is essential for various bodily functions.

  • Animals also need to transport waste materials for removal.

  • The circulatory system, consisting of the heart and blood vessels, facilitates this transport.

Circulatory System Overview

  • Blood: The fluid that circulates in blood vessels, transporting nutrients, oxygen, and waste.

    • Carries digested food from the small intestine to other parts of the body.

    • Transports oxygen from the lungs to body cells and takes waste for removal.

    • Composed of plasma and various types of cells: red blood cells (RBC), white blood cells (WBC), and platelets.

Blood Composition

  • Red Blood Cells (RBC): Contain hemoglobin which binds with oxygen; responsible for the red color of blood.

    • Essential for efficient oxygen transport to all cells.

  • White Blood Cells (WBC): Function in the immune response against germs.

  • Platelets: Involved in blood clotting; form clots to plug cuts and injuries.

Blood Vessels

  • Arteries: Carry oxygen-rich blood away from the heart; have thick elastic walls to withstand high pressure.

  • Veins: Carry carbon dioxide-rich blood back to the heart; have thinner walls and valves to prevent backflow.

  • Blood circulates through capillaries, where exchange of substances occurs.

Heart Functionality

  • The heart is a muscular organ that pumps blood continuously.

  • Divided into four chambers: two atria (upper) and two ventricles (lower).

  • Prevents mixing of oxygen-rich and carbon dioxide-rich blood using partitions.

  • Average heartbeat rate: 70-80 beats per minute in adults.

Blood Donation

  • Voluntary blood donation is crucial as it can save lives; stored safely in blood banks.

Excretion in Animals

Waste Products Management

  • Excretion: Process of removing waste substances from the body, performed by the excretory system.

  • In humans, excretory system includes:

    • Kidneys: Filter blood, remove waste, and produce urine.

    • Ureters: Transport urine from kidneys to bladder.

    • Urinary Bladder: Stores urine until excretion.

    • Urethra: Channel through which urine is expelled.

  • Average urine output: 1-1.8 liters in 24 hours.

Types of Excretion by Organisms

  • Aquatic Animals: Excrete ammonia directly into water.

  • Land Animals: Excrete semi-solid uric acid (birds) or urea (humans).

Role of Sweating

  • Sweating helps cool the body and remove salts.

Transportation in Plants

Nutrient and Water Transport

  • Plants absorb water and minerals through roots, utilizing root hairs for increased surface area.

  • Xylem: Vascular tissue responsible for transporting water and minerals from roots to leaves.

  • Phloem: Transports the food produced by leaves to other parts of the plant.

Importance of Transport Mechanism

  • Water and nutrients absorbed are vital for photosynthesis and overall growth and function.

  • Plants lose water through transpiration, creating a suction pull that aids in the movement of water upwards.

Summary Points

  • Blood circulates, delivering nutrients and oxygen to cells, and carrying wastes.

  • Circulatory system includes heart, arteries, veins, and various types of blood cells.

  • Excretory system removes waste, with kidneys playing a key role.

  • Plants utilize xylem and phloem for effective transport of water, minerals, and food.

Keywords

  • Ammonia, Artery, Blood, Blood vessels, Capillary, Circulatory system, Dialysis, Excretion, Excretory system, Haemoglobin, Heartbeat, Kidneys, Phloem, Plasma, Platelets, Pulse, Red blood cell, Root hair, Stethoscope, Sweat, Tissue, Urea, Ureter, Urethra, Uric acid, Urinary bladder, Vein, White blood cell, Xylem.