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A scientist is designing an artificial multi-cellular organism. Which system is essential for internal transport of gases and nutrients?
Circulatory system
Excretory system
Skeletal system
Endocrine system
Circulatory system
The circulatory system is the primary physiological mechanism responsible for the transport of respiratory gases, nutrients, hormones, and metabolic wastes across the cells of complex multi-cellular organisms. In larger organisms, diffusion alone is insufficient to meet the metabolic demands of deep-seated tissues, necessitating a bulk-flow transport system.
The circulatory system is the primary physiological mechanism responsible for the transport of respiratory gases, nutrients, hormones, and metabolic wastes across the cells of complex multi-cellular organisms. In larger organisms, diffusion alone is insufficient to meet the metabolic demands of deep-seated tissues, necessitating a bulk-flow transport system.
Think of the circulatory system as a city's highway and pipeline network that delivers groceries and water to every individual house, as carrying supplies manually from the edge of the city would be too slow.
T-N-H-W: Transport (Nutrients), Hormones, and Waste.
Q=R╬ФPтАЛ тАФ where Q is flow, ╬ФP is pressure difference, and R is resistance (Ohm's Law for fluid flow).
The system utilizes a pump (heart) to create hydrostatic pressure, driving blood through a network of vessels (arteries, veins, capillaries). Nutrient exchange occurs primarily at the capillary beds via passive diffusion driven by concentration gradients, while gas transport is facilitated by binding proteins like hemoglobin (Hb+4O2тАЛтЖФHb(O2тАЛ)4тАЛ).
Diffusion is only effective for distances less than 1 mm, making circulatory systems mandatory for larger organisms.
The system links the digestive, respiratory, and excretory systems to maintain homeostasis.
Hemoglobin in vertebrates significantly increases the oxygen-carrying capacity of blood.
Efficient delivery of nutrients to distant tissues
Rapid removal of metabolic waste products
Essential for thermal regulation in endotherms
Requires high energy investment to maintain pump function
Risk of systemic failure if any vessel is compromised
Human cardiovascular system
Open circulatory system in insects (hemolymph transport)
Excretory system focuses on waste removal (filtration), not nutrient distribution.
Skeletal system provides structural support, not transport.
Endocrine system regulates processes via chemical messengers, but relies on the circulatory system for delivery.
A is correct тАФ The circulatory system acts as the vital transport infrastructure ensuring oxygen and nutrients reach all cells in a multi-cellular body.
In competitive exams, if a question mentions 'transport of substances' over long distances in an organism, always link it to the circulatory or vascular system.
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