What is the function of the blood vessels and capillaries ?

RRB Staff Nurse Ahmedabad-2015

Applied Anatomy

Easy

Appeared in: RRB Staff Nurse Ahmedabad-2015

Explanation

The correct answer identifies the primary role of the vascular network, which is transportation.
Blood vessels (arteries, veins) and capillaries form a continuous, closed system to transport blood throughout the body.
Arteries carry blood away from the heart, veins carry blood toward the heart, and capillaries connect them, allowing for exchange with tissues.
This transportation system is essential for delivering oxygen and nutrients and removing metabolic waste products from all cells.

Option A: This describes the function of the heart muscle. The heart is the pump; blood vessels are the pipes or conduits through which the blood flows.
Option B: This describes the primary function of the kidneys and, to some extent, the liver. These organs filter waste products and toxins from the blood.
Option D: This describes the function of the nervous system, specifically motor neurons that transmit nerve impulses from the central nervous system to muscles, causing contraction.

Visual 1: Diagram - A schematic of the human circulatory system, showing the heart, major arteries (in red) carrying oxygenated blood, and major veins (in blue) carrying deoxygenated blood. This helps visualize the complete transport network.
Visual 2: Infographic - A cross-section comparison of an artery, a vein, and a capillary. The infographic should highlight the differences in wall thickness, lumen size, and the presence of valves in veins, explaining how structure relates to function.

Clinical Relevance

Nursing practice connection: Knowing Function of blood vessels and capillaries in the circulatory system helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Understanding blood vessel function is fundamental to nursing assessments like measuring blood pressure (pressure in the arteries), checking pulses (arterial pressure wave), and assessing capillary refill (tissue perfusion).
Nurses monitor for signs of impaired circulation, such as in peripheral vascular disease, where narrowed arteries reduce blood flow to the limbs.
What if a patient develops a deep vein thrombosis (DVT)? A blood clot obstructs a vein, impairing blood return to the heart. The nursing priority shifts to preventing the clot from traveling to the lungs (pulmonary embolism), administering anticoagulants, and monitoring the affected limb for swelling, pain, and redness.

How to Approach the Question

First, identify the key terms in the question: 'function,' 'blood vessels,' and 'capillaries.' This directs you to the circulatory system.
Recall the basic purpose of the circulatory system: to transport substances throughout the body.
Evaluate each option based on this core function.
Option A (pumping) is the heart's job. Eliminate it.
Option B (filtering impurities) is the kidneys' job. Eliminate it.
Option D (carrying messages) is the nervous system's job. Eliminate it.

Concept Tested & Keywords

Concept Tested: Function of blood vessels and capillaries in the circulatory system.
Stem keywords: function, blood vessels, capillaries
Lead-in keywords: What is

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