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It may be added that exactly the same tendency to superficial and arrested respiration takes place whenever there is any intense mental concentration, as in severe intellectual work. The arrest of respiration tends to render the blood venous, and thus aids in stimulating the vasomotor centers, raising the blood-pressure in the body generally, and especially in the erectile tissues.
The same remark applies to those "subjective sensations," as they are called, which are known to have as their physical cause subjective stimuli, consisting, in the case of sight, in varying conditions of the peripheral organ, as increased blood-pressure.
He tucked the sensing element under his armpit. "Hotter than a pistol," Dick said. "Why? Do I have a fever?" "Not unless you're a monkey. Next?" "Sphygmomanometer. And don't worry about the pronunciation. The blood-pressure cuff." He traced the circuit, then inflated the rubber and fabric cuff. "You just had heart failure," Dick reported.
And there over the parapet the vine-clad hill quivered in the sunshine against the blue summer sky, and around us were cheerful folk at lunch forgetful of hearts and blood-pressure in the warm beauty of the day.
The tough wall of the human uterus and the increased blood-pressure caused by the erect position cause the difference between menstruation in the human female and rut in the lower animals.
Thus, though the force of the heart and the general average blood-pressure remain the same, the state of the circulation may be very different in different parts of the body. The importance of this local control over the circulation is of the utmost significance. Thus an organ at work needs to be more richly supplied with blood than when at rest.
It is favoured by anything which throws excessive strain on the vessel walls, such as heavy muscular work; by chronic alcoholism and syphilis; or by such general diseases as tend to raise the blood-pressure for example, chronic Bright's disease or gout. It occurs with greater frequency and with greater severity in men than in women.
The mercury jumped up and down without seeming to stop anywhere; but the doctor said it registered two hundred and thirty-seven or one hundred and sixty-five or some such number. "Now," said he, "you see what alcohol does to the blood-pressure." "It's marvellous," said I, "but do you think it a sufficient test? Have one on me, and let's try the other arm." But, no! Then he grasped my hand.
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