A text-book of first aid and emergency treatment . undsmade by the contraction of the heart, and can, if necessary,count the beats as they occur. However, for most practical purposes, the rate of thehearts action is taken from the pulsation of the radialartery at the wrist, to which the impulse of the action of theheart is transmitted through the bloodvessels. Conse-quently, we can count the beats at the wrist where the pulsa-tion is termed the pulse, and we speak of the pulse as beingseventy-two beats to the minute in the average adult. In young children the pulse-rate may be much faster, apu
A text-book of first aid and emergency treatment . undsmade by the contraction of the heart, and can, if necessary,count the beats as they occur. However, for most practical purposes, the rate of thehearts action is taken from the pulsation of the radialartery at the wrist, to which the impulse of the action of theheart is transmitted through the bloodvessels. Conse-quently, we can count the beats at the wrist where the pulsa-tion is termed the pulse, and we speak of the pulse as beingseventy-two beats to the minute in the average adult. In young children the pulse-rate may be much faster, apulse-rate of 100 in a baby not being uncommon. In nervousindividuals very slight causes may be sufficient to send thel)ulse to 100 or even considerably higher. The Arteries.—When the blood leaves the heart it passesinto large musculofibrous tubes, which divide into smallertubes; these in turn divide and subdivide into still smallertubes, like the trimk and l)ranches of a tree. These tubesare called arteries and serve to carry the blood away from. THE BLOOD AND CIRCULATION 47 the heart. The largest artery, the aorta, gives oft branchessoon after it leaves the heart, which pass up on each side ofthe neck to supply the corresponding sides of the neck andhead. A little farther along a large artery is given oft to
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