Which is a key substance transported by the cardiorespiratory system?

Question

BlackTom AI · Accepted Answer

The cardiorespiratory system transports oxygen, carbon dioxide, nutrients, hormones, and metabolic wastes between the lungs, heart, blood vessels, and body tissues. It consists of the respiratory system (airways and lungs) that exchanges gases, and the cardiovascular system (heart and blood vessels) that moves blood carrying dissolved substances to and from cells.

Step-by-step reasoning:
1. Identify the system’s primary role: deliver substances required for cellular function (oxygen and nutrients) and remove wastes (carbon dioxide, metabolic byproducts).
2. List typical transported substances: oxygen (from lungs to tissues), carbon dioxide (from tissues to lungs), nutrients absorbed from digestion (glucose, amino acids, fatty acids, vitamins, minerals) carried in blood, hormones distributed via the bloodstream, and waste products sent to excretory organs.
3. Compare each answer option against this list:
   - Nutrients: These are classic cargo of the blood; absorbed in the digestive tract and transported by the cardiovascular system to cells for energy and synthesis. Capillary exchange delivers nutrients to tissues—this directly matches the system’s transport role.
   - Diastolics (diastolic pressures): This term refers to diastolic blood pressure (the pressure in arteries during cardiac relaxation). It is a measurement, not a transported substance.
   - Mitochondria: Intracellular organelles that produce ATP within cells. They are not substances the blood transports between organs as a primary function.
   - Systolics (systolic pressures): Like diastolic, systolic refers to blood pressure during heart contraction, again a measurement rather than a transported material.

Why the correct answer is correct: Nutrients are actively moved by blood to sustain cells; other options are pressure terms or organelles and do not represent materials transported by the cardiorespiratory system. Therefore, the correct answer is nutrients, which matches the provided answer.

Which is a key substance transported by the cardiorespiratory system?单项选择题

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