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Heart and circulation

LOW BLOOD PRESSURE

26-02-18
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Heart and circulation

Hypotension or low blood pressure shows chronic blood pressure values below the systolic (upper value) 100 mm/HG and diastolic (lower) of 60 mm/HG. In contrast to hypertension (elevated blood pressure), in most cases there is no sensation, whereas with hypotension sometimes there is discomfort and a feeling of dizziness and drowsiness, which can lead to fainting attacks. While hypertension lasting years can lead to cardiovascular disease and, in extreme cases, death, hypotension does not present such a risk. read more ...

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HIGH BLOOD PRESSURE

04-12-17
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Heart and circulation

Blood pressure is the force by which the heart pumps blood through the body's blood vessels. There is also arterial blood pressure, which measures the pressure in the arteries. The value is typically specified as 2 numbers. The first value is the systolic pressure, and the second value is the diastolic pressure. While the heart is pumping, the pressure is higher, which is indicated as systolic pressure. The pressure, when the heart is relaxed, is indicated as diastolic pressure. read more ...

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HEART

14-11-17
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Heart and circulation

The heart is made up of unique muscle fibres which are electrostatically-charged on the surface. When a nerve impulse reaches the surface, the voltage discharges a small electric shock that triggers a muscle contraction. There is a short pause then an enzyme system restores the electrostatic voltage. The normal muscle fibres then wait for the next nerve impulse; however, the heart muscle fibres are not anticipating this impulse. The enzyme system is not self-limiting, but rather drives the voltage higher and higher, until the spark jumps on its own. At its quickest, this occurs through the muscle cells at a certain point in the right atrium. They discharge at pulse speed. read more...

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CIRCULATION

14-11-17
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Heart and circulation

The equilibrium organ is the seat of the sense of balance. This is a sensory perception mechanism necessary for movement coordination, balance as well as orientation of the body in space. The equilibrium organ, also called the vestibule organ, belongs structurally to the inner ear and contains sensors that tell the brain about the position and movement of the head in space. It consists primarily of fluid-filled semi-circular canals and the two macula organs, sacculus and utriculus. Acceleration of the head causes the fluids in the equilibrium organ to flow. The movements of the liquid activate receptors, which subsequently transmit the signals to the brain through these movements. read more...

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