Control of Heart Rate in Humans

Slides:



Advertisements
Similar presentations
The Cardiac Cycle describe the cardiac cycle, with reference to the action of the valves in the heart; explain how heart action is coordinated with reference.
Advertisements

Topic Option H5 Transport System
Regulation of blood gases and blood pressure
Nervous Control of the Heart
2  SAN sets heart rate at beats per minute  Nerves act as  Vagus nerve  Sympathetic nerve about 120 brake and accelerator slows heart rate speeds.
AS PE PHYSIOLOGY EXAM QUESTIONS & MARK SCHEMES
5.2 The cardiac cycle. Learning outcomes Students should understand the following: Myogenic stimulation of the heart and transmission of a subsequent.
CARDIAC CYCLE Renee Anderson.
Chapter 13 Heart Rate and Blood Pressure. The Cardiac Cycle Each Heartbeat is called a Cardiac Cycle Step 1: the two atria contract at the same time –
Heart Function Learning Objectives: To understand the structure of the heart; To understand the relationship between cardiac output, stroke volume and.
Control of heart rate.
Pulmonary Circulation
+ B5b circulatory systems and the cardiac cycle. + Objectives Describe and explain double and single circulations, structure of the heart and circulatory.
Heart Rate and Blood Pressure Heart rate (or pulse) is how fast your heart is beating. It is measured in beats per minute (bpm). An average resting pulse.
Chapter 16.2: Blood Flow Through Blood Vessels. Resistance -Vascular Resistance: the opposition to blood flow due to friction between blood and blood.
The Transport System Mr. Tamashiro Draw and label a diagram of the heart showing the four chambers, associated blood vessels, valves and the route.
The Heart Control of the Heart Beat The Heart Beat The heart is made up of cardiac muscle. Cardiac muscle is myogenic, which means it naturally contracts.
Chapter 13 Review # The second heart sound (dup) is created by the: a. closing of the A-V valves b. opening of the A-V valves c. closing of the.
Transport Draw and label a diagram of the heart showing the four chambers, associated blood vessels, valves and the route of blood through the heart.
RECAP FROM THE PREVIOUS LESSON. Describe how the conduction system of the heart controls the cardiac cycle. [4 marks]. Using the work you did for homework,
Learning Objectives... To understand the stages of the cardiac cycle.
Unit 6: Human Health And Physiology Lesson 6.2 The Transport System.
Nervous System The ANS and Simple Behaviour Patterns.
H.5 The Transport System. IB Assessment Statement H.5.1 Explain the events of the cardiac cycle, including atrial and ventricular systole and diastole,
Control of Heart Rate Control of Heart Rate.
Gas Exchange in Humans The control of the rate of breathing (ventilation)
Heart rate response to exercise Cardiac control centre
BIOLOGY FORM The Circulatory System.
Conducting system of the heart. Control of coordination an timing Where does the heart beat originates from? The heart itself How is it regulated? By.
Heart Function Learning Objectives:
Higher Human Biology. Cardiac Conducting System  The heart beat originates in the heart itself.  Heart muscle cells are self contractile  They are.
Topic 6 – Human Heath and Physiology 6.2 – The Transport System.
A reflex arc: the story of a pin prick Learning Outcomes: Explain the roles of sensory neurones, motor neurones, the CNS, intermediate neurones, synapses.
Heart Review from Day 1 On a whiteboard: 1. Draw and label a diagram of the heart including: The 4 chambers Associated blood vessels Valves The path of.
The Show. The Heart The heart is a bag of cardiac muscle filled with blood Has 4 chambers: 2 atria & 2 ventricles Right side contains oxygenated blood.
The Heart Circulatory System Ms. Lowrie Advanced Biology 11.
Anatomy and Physiology Unit 5 Sophie Bevan. ‘The same state’ Equilibrium Negative feedback Homeostasis The way your body attempts to maintain constant.
Cardiovascular Regulation Coleman Exercise Physiology McArdle, Katch, and Katch, 4 th ed.
Cardiac Function Understand the structure of the heart and cardiac cycle. Understand the terms Cardiac output, stroke volume, heart rate and the relationship.
THE CARDIAC CYCLE SYSTOLE : contraction DIASTOLE : relaxation
AS PE PHYSIOLOGY EXAM QUESTIONS & MARK SCHEMES
B – The Cardiovascular System
Key Revision Points for Cardiac Function
5.1.5 Animal Responses – Adrenaline and Controlling Heart Rate
The Structure and Function of the Heart
Some Most All Control of heart rate WAL:
Lesson starter Name the four heart chambers
Module 5 Communication, homeostasis & energy
Starter – 5 marks.
Module 4 Responding to the environment
Chapter 13 Review.
Topic 6.2 – The blood system
Heart Function Learning Objectives:
Heart Structure and Function
By Sophia Mahfooz 7.3 PEAK PERFORMANCE.
Cardiac Conduction System
The Heart Section 11.4.
Cardiovascular System
The Cardiac Cycle describe the cardiac cycle, with reference to the action of the valves in the heart; explain how heart action is coordinated with reference.
Heartbeat Control: Intrinsic
Nervous/ Neural Control
Biology 20 - Circulation Beat Still My Heart
Cardiovascular Circuits & Heart Physiology
Human physiology 6.2 Transport System 6.4 Gas Exchange 6.1 Digestion
Paper 1 Applied Physiology Heart Function
Homeostasis of gas concentrations & blood pressure
REGULATION OF BLOOD PRESSURE
A LEVEL BIOLOGY 8 TOPICS 12 REQUIRED PRACTICALS 3 EXAMS.
Key Area 2.6 – The Structure and Function of the Heart
Presentation transcript:

Control of Heart Rate in Humans

Starter Label heart diagrams

Structure of the heart deoxygenated blood to the lungs oxygenated blood to the body deoxygenated blood from the body oxygenated blood from the lungs

Learning Objective Success Criteria Know how we control heart rate Outline the hormonal and nervous mechanisms involved in the control of heart rate

Cardiac Cycle Using the key words below in pairs write a paragraph to describe the cardiac cycle Pacemaker, Atrio-Ventricular node, myogenic, Sino-Atrial node, Atria, Ventricles, Purkyne Tissue When finished swap with another pair and see if you can improve their work

Think about what happens: when you walk down a quiet road late at night and you’re afraid your being followed Or before an exam.

sympathetic Nervous System Increases the heart rate, to increase oxygen supply to the muscles. Increases the ventilation rate, so that more oxygen can be absorbed in the lungs. Decreases peristalsis in the gut so there is more blood available for the heart and lungs. Other parts of the body also respond to enable increased sensory awareness eg pupils dilate

Parasympathetic Nervous System Relaxing responses - decreases over all physical activity, so it is associated with rest. It decreases heartbeat rate It decreases ventilation rate It increases peristalsis in the gut, so that food can be digested

Nervous Control of Heart Rate Nerves from cardiovascular centre in medulla oblongata (in brain) supply heart Connect to SAN Effect frequency of beats Action potentials sent down the accelerator nerve (sympathetic NS) increase heart rate Action potentials sent down the vagus nerve (parasympathetic NS) decrease heart rate

Hormonal Control of Heart Rate Heart muscle responds to adrenaline in blood

Normal conditions Resting heart rate controlled by SAN Varies from person to person Frequency of 60-80 beats per min This can be controlled by the cardiovascular centre in the medulla oblongata

Factors that affect Heart Rate Movement of limbs detected by stretch receptors in muscles Send impulse to cardiovascular centre Increases heart rate Production of CO2 during exercise Reduces blood pH Detected by chemoreceptors in carotid arteries, aorta and brain

Factors that affect Heart Rate Decrease in CO2 after exercise Reduces activity of accelerator nerve Decrease in heart rate Adrenaline secretion Increases heart rate Blood pressure Monitored by stretch receptors in walls of carotid sinus Blood pressure too high, impulse sent to cardiovascular centre, impulse sent down vagus nerve

Artificial Pacemaker Read a section of information on artificial pacemakers and make notes about its development, forming a timeline

Heart Rate Jan 11 [5]

Heart Rate Jan 11 Markscheme