| ACT: #2: THE VESSELS
Insert notes on the vessels here. Give the structural differences and function of the following vessels: ARTERY, VEIN, ARTERIOLE, and CAPILLARY Which are the largest in diameter? Which are the smallest in diameter? EXTRA CREDIT: Get slides of the �artery and vein�. Draw a sketch of both and please label which is which. ACT #3: THE HEART Include the drawing from our class; we did this already when we looked at muscles. Study the diagram on page 919. Using a flow chart show how blood is transported through the heart. Blood enters the right atrium from the inferior and superior vena cave ACT #4: BLOOD PRESSURE Blood pressure is always expressed as 2 numbers. The first and larger number, called �systole� is when the heart is contracting. The second and smaller number, called �diastole� is when the heart is relaxing. Example, if your systolic = 130 and your diastolic is 70, this is read as �130 and 70.� A) Work in pairs, one person taking the other�s pressure. You�ll need the stethoscope and sphygmornanometer. Clean the ear piece of the stethoscope with the alcohol pad. B) Have your �patient� seated with the elbow slightly bent and the arm resting on the table, palm up. Loosely wrap the cuff around the upper arm. C) With your fingers locate the pulse in the brachial artery. D) Place the stethoscope over the pulse. You won�t hear anything now. Tight then cuff and check the gauge�up to 160 and NO further. E) Let the air out slowly while one student is listening carefully through the stethoscope. At some point you should begin to hear the heart beat. F) Record the dial reading when you hear the first beat. SYSTOLIC pressure = _____. G) Record the dial when you hear the last beats as you continue to release the air. This is your DIASTOLIC pressure = _____. An �average� teenager�s blood pressure is 120 / 70. Please use the lab manual pg. 640-641 to answer the following questions. 1) What is blood pressure exactly? 2) What is it caused by? 3) Why is there a difference in blood pressure between the artia and the ventricles? |