Q:

What are the effectors that cause vasodilation and vasoconstriction?

A:

Some common effectors that cause vasoldilation and vasoconstriction include heat, medications, antidiuretic hormones and nitric oxide according to Midlands Technical College. When heat, a drop or rise in blood pressure or hormonal changes occur, patients' vessels may dilate or constrict thanks to impulses from the brain stem. The vasomotor center in the brain stem, which is made up of sympathetic neurons in the medulla, changes the diameter of blood vessels.

External factors influence the impulses sent to the vasomotor center, and then the vasomotor center takes control by adjusting the vascular system's blood vessels accordingly. In some cases, the system may increase or decrease heart rate as well as constrict blood vessels. In others, the actual volume of blood may be increased or decreased.


Is this answer helpful?

Similar Questions

  • Q:

    How is body temperature maintained by vasodilation?

    A:

    Swelling of blood vessels increases the amount of heat carried by the blood to the skin, allowing the excess heat to be expelled from the body. Blood vessels also constrict and conserve heat to raise body temperature.

    Full Answer >
    Filed Under:
  • Q:

    What causes broken facial capillaries?

    A:

    Facial capillaries can be damaged by cold weather, dryness, aging and certain medical conditions, according to Dr. Bailey, dermatologist. Once these capillaries have been damaged, they show up as blotchy red spots on the skin.

    Full Answer >
    Filed Under:
  • Q:

    What is the function of hemoglobin?

    A:

    InnovateUs states that the main function of hemoglobin is transporting oxygen from the lungs to other parts of the body. It is an important chemical in red blood cells that carries oxygen, and performs different effect modulation and gas transport duties.

    Full Answer >
    Filed Under:
  • Q:

    What factors help blood move through veins?

    A:

    Blood moves through veins when it is pushed by muscle contractions. Unlike arteries, which carry blood away from the heart in response to the rhythmic contractions of the left ventricle, veins are a low-pressure system that pushes blood toward the heart by means of a series of smooth muscle contractions known as peristalsis.

    Full Answer >
    Filed Under:

Explore