Answer:
ECG paper is a grid where time is measured along the horizontal axis.
Each small square is 1 mm in length and represents 0.04 seconds.
Each larger square is 5 mm in length and represents 0.2 seconds.
Voltage is measured along the vertical axis.
10 mm is equal to 1mV in voltage.
The diagram below illustrates the configuration of ECG graph paper and where to measure the components of the ECG wave form
Heart rate can be easily calculated from the ECG strip:
When the rhythm is regular, the heart rate is 300 divided by the number of large squares between the QRS complexes.
For example, if there are 4 large squares between regular QRS complexes, the heart rate is 75 (300/4=75).
The second method can be used with an irregular rhythm to estimate the rate. Count the number of R waves in a 6 second strip and multiply by 10.
For example, if there are 7 R waves in a 6 second strip, the heart rate is 70 (7x10=70).
Answer:
b. increases; decrease
Explanation:
During inhalation the diaphragm contracts causing the expansion of the lung volume and chest wall. The lung pressure decreases and is lower than the atmospheric pressure causing air to be drawn through the nose/mouth.
Answer: Venous bleeding
Explanation:
The external bleeding can be define as the bleeding in which the blood leaves the body due to external injury. The internal bleeding is the bleeding which occurs inside the body that may occur due to internal injury. There are about three types of external bleeding named as capillary, venous and arterial.
Capillary bleeding is most common and results from damage of tiny capillaries. Arterial bleeding is one of the serious type. The blood will spurt out from damage artery. It involves large amount of blood loss.
Venous bleeding occurs when a vein is subjected to cut, blood will steadily flow. If a deep vein is cut then the bleeding cannot be controlled and it can be fatal.