What is the function of the blood vessels and capillaries?

RRB Staff Nurse Mumbai-2015

Applied Anatomy

Easy

Appeared in: RRB Staff Nurse Mumbai-2015

Explanation

The primary role of the vascular system is to serve as a comprehensive transport network, ensuring blood reaches every part of the body.
Arteries and veins act as the main highways, carrying blood to and from the heart, respectively.
Capillaries are the crucial connection points within tissues where the exchange of oxygen, nutrients for cells, and waste products like carbon dioxide takes place.

Option A: Blood vessels are passive conduits; they do not generate the force to pump blood. The heart is the organ responsible for pumping.
Option B: The primary organs for filtering blood impurities are the kidneys, which process blood to form urine, and the liver, which metabolizes toxins.
Option D: This describes the function of the nervous system. Nerves (neurons) transmit electrochemical signals from the brain and spinal cord to muscles to initiate contraction.

Visual 1: Diagram - A simplified overview of the circulatory system, clearly labeling the heart, arteries (in red, moving away from the heart), veins (in blue, moving toward the heart), and capillary beds in the body's tissues. This visualizes the complete transport circuit.
Visual 2: Infographic - A comparative chart detailing the structural differences between arteries, veins, and capillaries, highlighting wall thickness, presence of valves, and lumen diameter, and linking these features to their specific functions (e.g., high pressure vs. low pressure).

Clinical Relevance

Nursing practice connection: Knowing Function of the Vascular System (Blood Vessels and Capillaries) helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
A core nursing responsibility is assessing the adequacy of peripheral circulation. This is done by checking pulses, measuring blood pressure, observing skin color and temperature, and testing capillary refill time (CRT).
What if? A patient's capillary refill time is greater than 3 seconds. This indicates poor perfusion. The nurse's priority is to assess for other signs of shock (e.g., hypotension, tachycardia), elevate the patient's legs (if not contraindicated), and immediately notify the healthcare provider, as this can signify a life-threatening condition like dehydration or circulatory collapse.

How to Approach the Question

Step 1: Identify the key terms in the question: 'function', 'blood vessels', and 'capillaries'. This directs you to the circulatory system.
Step 2: Analyze each option based on your knowledge of basic human physiology.
Step 3: Evaluate Option A ('pump blood'). Recall that the heart is the pump, not the vessels. Eliminate this option.
Step 4: Evaluate Option B ('filter impurities'). Recall that the kidneys are the body's primary filtration system. Eliminate this option.
Step 5: Evaluate Option D ('carry messages'). Recall that the nervous system carries messages. Eliminate this option.
Step 6: Evaluate Option C ('carry blood'). This is the fundamental definition of the vascular network's purpose. This aligns with the roles of arteries, veins, and capillaries. This is the correct answer.

Concept Tested & Keywords

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