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Explanation: Cardiac muscles work involuntarily and are responsible for the continuous beating of the heart.
Explanation: Different plant parts such as roots (carrot), stems (potato), and leaves (spinach) can store food.
Explanation: Respiration breaks down food molecules like glucose to release energy for cellular activities.
Explanation: The medulla oblongata controls involuntary functions like heartbeat, breathing, and blood pressure.
Explanation: Melanin is the pigment produced by skin cells that determines skin color and protects against UV radiation.
Explanation: Mature red blood cells in humans lack a nucleus to provide more space for hemoglobin to carry oxygen.
Explanation: The smooth endoplasmic reticulum synthesizes lipids, phospholipids, and steroids, and also helps in detoxification.
Explanation: The dermis contains sweat glands, hair follicles, and blood vessels, playing a role in temperature regulation.
Explanation: Veins have valves that ensure blood flows in one direction back toward the heart.
Explanation: The ureters are tubes that transport urine from each kidney to the urinary bladder.
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