PEShare.co.uk Shared Resource

785 views

Published on

Published in: Health & Medicine, Business
0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
785
On SlideShare
0
From Embeds
0
Number of Embeds
196
Actions
Shares
0
Downloads
9
Comments
0
Likes
1
Embeds 0
No embeds

No notes for slide

PEShare.co.uk Shared Resource

  1. 1. The Heart Aims: Be able to label the structure of the heart. To know what stroke volume, cardiac output and heart rate.
  2. 2. The Heart THE HEART IS A MUSCULAR PUMP. IT IS DIVIDED INTO 2 HALVES BY A PARTITION CALLED THE SEPTUM (NOT SHOWN) EACH HALF IS THEN DIVIDED AGAIN BY VALVES. THESE ARE CALLED ATRIUMS (ABOVE) AND A VENTRICLES (BELOW
  3. 3. Cont. <ul><li>THE HEART IS A DOUBLE PUMP. THAT’S BECAUSE IT HAS TWO SIDES. </li></ul><ul><li>What does each side do? </li></ul><ul><li>THE AORTA IS THE LARGEST ARTERY </li></ul><ul><li>THE VENA CAVA IS THE LARGEST VEIN </li></ul><ul><li>THE PULMONARY ARTERY IS THE ONLY ARTERY CARRYING DEOXYGENTAED BLOOD. </li></ul><ul><li>Refer to pulmonary and systemic circulatory networks. </li></ul>
  4. 4. Heart rate (HR) <ul><li>This is the number of times the heart ventricles beat in one minute. </li></ul><ul><li>The average resting HR is 72 beats per minute (BPM). </li></ul><ul><li>To calculate your maximum HR; subtract your age from 220. </li></ul><ul><li>220 - age = max HR. </li></ul>
  5. 5. Cont. <ul><li>A low resting HR may indicate a high level of aerobic/endurance fitness. Some highly trained endurance athletes have measured resting HR as low as 28bpm. </li></ul><ul><li>HR below 60bpm is known as bradycardia. </li></ul><ul><li>This is slow because of the increase in stroke volume caused by an increase in the heart muscle wall. </li></ul><ul><li>This is called hypertrophy (increase in muscle size). </li></ul>
  6. 6. Stroke Volume (SV) <ul><li>This is the amount of blood that is ejected from the ventricles during ventricular systole. </li></ul><ul><li>SV is the difference in the volume of blood in the ventricles before and after ventricular contraction. </li></ul>
  7. 7. Cont. <ul><li>End – diastolic volume (EDV) = The volume of blood in the ventricles at the end of the relaxation filling phase . </li></ul><ul><li>End – systolic volume (ESV) = The volume of blood remaining in the ventricles at the end of contraction phase (ejection of blood). </li></ul><ul><li>The heart never ejects all of the blood, why? </li></ul><ul><li>The average SV is 70ml (refer to pg 59). </li></ul>
  8. 8. Cardiac Output (Q) <ul><li>Cardiac output is the relationship between SV and HR. It is the volume of blood ejected from the heart ventricles in one minute. </li></ul><ul><li>Q = SV x HR </li></ul><ul><li>(L/min) = (ml per beat) x (beats per min) </li></ul>
  9. 9. Blood Pressure <ul><li>Blood pressure refers to the force exerted by circulating blood on the walls of blood vessels , and generally refers to arterial pressure </li></ul><ul><li>For each heartbeat, blood pressure varies between systolic and diastolic pressures. </li></ul><ul><li>Systolic pressure is peak pressure in the arteries, which occurs near the beginning of the cardiac cycle when the ventricles are contracting. Diastolic pressure is minimum pressure in the arteries, which occurs near the end of the cardiac cycle when the ventricles are filled with blood. </li></ul>
  10. 10. Cont. <ul><li>Blood Pressure is measured in millimetre of mercury (mmHg) </li></ul><ul><li>Normal Blood pressure is 120/80 mmHg </li></ul><ul><li>Hypotension (Low blood pressure) is anything less then 90/60 mmHg </li></ul><ul><li>Hypertension (High blood pressure) is anything over 140/90 mmHg </li></ul>
  11. 11. Homework <ul><li>Find out the responses of HR, SV and Q to exercise. </li></ul><ul><li>Learn the structure of the Heart for next week </li></ul><ul><li>Explain the effects of the release of adrenalin on heart rate prior to exercise and why is it beneficial to an athletes performance [3 marks]. </li></ul>

×