Dead xylem vessels form continuous tubes for water transport. Living leaf cells lose water through transpiration, creating transpiration pull. This pull draws water upward through xylem against gravity, maintaining continuous movement from roots to leaves in plants.
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Nervous tissue enables us to sense heat or cold. Specialised nerve cells called neurons receive sensory information from receptors in the skin and transmit messages to the brain, which interprets the sensations and produces appropriate responses.
Blood clotting is caused by platelets present in blood. When injury occurs, platelets gather at the wound and help form a clot, preventing excessive blood loss and protecting the body from harmful microorganisms entering through cuts.
Connective tissue holds the body together and supports different organs and tissues. It binds skin, muscles and bones, providing strength, support and attachment, ensuring body parts remain connected and properly organised during movement and daily activities.
Yes, many body movements are involuntary and occur automatically without conscious control. Examples include heartbeat, digestion and movement of food in the intestine. Smooth muscles and cardiac muscles perform these essential activities continuously throughout life.