capillaries

Although the speed of blood flow through the capillaries is the same during rest and work, the oxygen supply increases because so many capillaries are open and each capillary can hold more blood.

Schack August Steenberg Krogh - A Versatile Genius 2001

Instead, Krogh elegantly and clearly demonstrated (by measurements of the oxygen content in capillaries and muscle fibers, direct observations and histological sections) that a relatively small number of capillaries are open during rest.

Schack August Steenberg Krogh - A Versatile Genius 2001

The pathway followed by small, watersoluble molecules in muscular capillaries is still under investigation.

George E. Palade - Autobiography 1975

But all the contradictions disappear, as Krogh made clear, if, in the calculation mentioned above, the distance between blood-filled capillaries is varied in relation to the oxygen consumption, or, in other words, if it is accepted that the capillaries in muscle tissue are all filled with blood only when the tissue is at its most active.

Physiology or Medicine 1920 - Presentation Speech 1967

All doctors are trained in the absolute nature of the blood–brain barrier—a wall of tightly packed cells lining the smallest blood vessels of the brain, called capillaries, and a back-up defensive team of astrocytes star-shaped cells of the glia that holds this tightly packed wall together.

The UltraMind Solution M.D. Mark Hyman 2009

Bruises form when small blood vessels known as capillaries break near the skin surface.

CNN Transcript Aug 21, 2008 2008

I describe as the capillaries 'tonus the fact that they have the power of contracting to a greater or lesser extent, and of maintaining themselves contracted.

August Krogh - Nobel Lecture 1967

By direct observation, under the microscope, of living muscle, some from the frog, some from small mammals, it was comparatively easy to determine that the number of visible capillaries, which is the same as the number of capillaries through which blood flows, was rather small in resting muscle, and only increases very appreciably when the muscle has been active for some seconds.

August Krogh - Nobel Lecture 1967

It secretes a kind of gum to patch weak points in the walls of the arteries and larger capillaries, which is reassuring to a man of my age,

A Gift From Earth Niven, Larry 1968

The capillaries are the finest vessels of all; quite microscopic in size.

Fantastic Voyage Asimov, Isaac, 1920- 1966