b) Blood flows from arteries into arterioles before entering capillaries.
Explain the role of the arterioles in the skin when a person is very cold.
Answers
Answer/Explanation:
When we get too cold: Muscles contract rapidly - we shiver. These contractions need energy from respiration , and some of this is released as heat. Blood vessels leading to the skin capillaries become narrower - they constrict - letting less blood flow through the skin and conserving heat in the body.
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Answer:
The specialized blood vessels known as arterioles may be small in stature, but they play a big role in heart health. As you might suspect, they're related to arteries, the blood vessels that carry oxygenated blood away from the heart and to the body's tissues. As you move down through the arterial network, these vessels get smaller and smaller like the branches of a tree. When arteries have decreased in size to less than 300 micrometers or one-hundredth of an inch, they're referred to as arterioles.
Before this, the blood must pass through the arterioles where its speed is constantly being adjusted. These adjustments can occur for any number of reasons, including a rise or fall in temperature, changes in physical activity, food, stress, or exposure to toxins or medications.
The function of the arterioles, therefore, is to regulate blood pressure so that it remains steady and less prone to fluctuation. By doing so, the blood will no longer be pulsing as it reaches the capillaries. Instead, the flow will be more continuous, allowing for the steady exchange of oxygen and carbon dioxide molecules.
Once the exchange is complete, the blood will make the inward journey through the network of veins, finally returning to the heart through the inferior and superior vena cava.