CIRCULATORY SYSTEM RESPIRATORY SYSTEM EXCRETORY SYSTEM Unit 9 CIRCULATORY SYSTEM RESPIRATORY SYSTEM EXCRETORY SYSTEM
Opener Humans breathe more rapidly during exercise than before it because during exercise the blood contains… A. An increased level of oxygen B. A decreased amount of hemoglobin C. A decreased number of red blood cells D. An increased level of carbon dioxide
Question #1 When blood leaves the heart, where does it exit? A. The aorta B. The capillaries C. The lungs D. The pulmonary vein
Question #2 When a small blood vessel in your hand is cut open, which plays an active defensive role against possible disease? A. Plasma B. Platelets C. Red blood cells D. White blood cells
Circulatory System Chapter 34.1
Circulatory System Transports blood Delivers – oxygen Removes – carbon dioxide
Circulatory System Blood Heart Blood vessels Lymphatic system
Blood Vessels A network of channels Circulate blood To and from heart
Blood Vessels Arteries Capillaries Veins
Blood Vessels Arteries – strong thick-walled for oxygen rich Capillaries – smallest branches exchange important one cell thick Veins – largest oxygen poor
The Heart A muscular organ Hollow Pumps oxygen - rich blood to body Oxygen-poor blood to lungs
Structure of the Heart Cardiac muscle Conducts electrical impulses Four chambers
Heart
Heart Top right atrium and left atrium Below right and left ventricles Thicker walls do all the work Valves = blood flows one way
How the Heart Beats The atria fill with blood, the atria contract, filling the ventricles with blood The ventricles contract to pump blood out of the heart and into the lungs
Pulse 70 times each minute Expansion and relaxation of the artery wall caused by contraction of the left ventricle
Blood Pressure A measure of how much pressure is exerted against the vessel walls by blood
Blood Flow in the Body
Blood Components Plasma Red Blood Cells Platelets White blood cells Human body has 5-6 liters
Plasma 50% of blood is plasma Clear fluid Mostly water Transports materials to and from
Red Blood Cells Carry oxygen Disc-shaped
Platelets Cell fragments Collect and stick Release chemicals
White Blood Cells Body’s disease fighters Signal or fight
Circulatory System Disorders Atherosclerosis – clogged arteries Causes heart disease, stroke or heart attack
Unit 9 RESPIRATORY
Opener Which of the following is a function of the nervous system? A. Releasing ATP into contracting muscle tissue B. Signaling muscle tissues to contract C. Producing lactic acid in fatigued muscle tissues D. Increasing cellular respiration
Quiz Draw and label a neuron. What is a Reflex Arc Pathway?
Question #1 Which process causes the diaphragm to move back up? A. Cellular respiration B. Exhalation C. Inspiration D. Internal respiration
Question #2 Which process occurs inside the tissue cells in your legs? A. Filtration B. Breathing C. External respiration D. Internal respiration
Chapter 34 Circulatory Respiratory Excretory System
Respiratory System Function – the exchange of oxygen and carbon dioxide The atmosphere and the blood The blood and the body’s cells
Importance of Respiration Body’s cells require oxygen Oxygen and glucose = make ATP molecules ATP = cell metabolism
Respiration Sustain cellular respiration Releases carbon dioxide and water
Respiratory System Function Supply oxygen to body cells Remove carbon dioxide waste from cells
Respiratory System Two processes
Respiratory System Two processes Breathing
Respiratory System Two processes Breathing Respiration
Respiratory System Two processes Breathing – Air enters the body. Mechanical movement of air in and out your body Respiration
Respiratory System Two processes Breathing – Air enters the body. Mechanical movement of air in and out your body Respiration – Gases exchanged in the body
Respiratory System Two processes Breathing – Air enters the body. Mechanical movement of air in and out your body Respiration – Gases exchanged in the body. External respiration and internal respiration
External Respiration Exchange of gases Atmosphere and the blood Lungs
Internal Respiration Exchange of gases Blood and body’s cells
Path of Air Nasal passages pharynx larynx epiglottis, trachea, lungs bronchi bronchioles Alveoli diaphragm
Path of Air Nasal passages pharynx larynx epiglottis, trachea, lungs bronchi bronchioles Alveoli diaphragm
Gas Exchange in the Lungs Air travels to individual alveoli Oxygen diffuses across Moist thin walls Capillaries Red blood cells
Red Blood Cells Oxygen transported Released to tissue cells
Carbon Dioxide While Oxygen is moving one way Carbon Dioxide moves the other
Breathing Brain directs the rate of breathing When Carbon Dioxide (CO2) increases Breathing rate increases
Breathing Diaphragm contracts Chest expands Diaphragm down Air in
Breathing Diaphragm contracts Chest expands Diaphragm down Air in Exhalation Diaphragm relaxes Chest reduces Air out
Excretory System CHAPTER 34.3
Question #1 The kidneys play a major role in maintaining A. The proper breathing rate B. Homeostasis by removing urea, water and other wastes from the blood C. The proper glucose levels in the blood D. The concentration of digestive enzymes in the blood.
Question #2 Which human body system includes the lungs, liver, skin, and kidneys? A. Respiratory B. Transport C. Excretory D. digestive
Excretory System Removes waste Regulates the water and salt Maintains pH
Excretory System Lungs Skin Kidneys
Excretory System Lungs – carbon dioxide Skin – water and salt Kidneys – major organ
Kidneys Filter out waste, water and salt
Kidneys Filter out waste, water and salt Renal cortex Renal medulla
Nephron Filtration Blood enters Glomerulus Blood stays All the rest pushed through
Nephron Filtration Blood enters Glomerulus Blood stays All the rest pushed through Convoluted tubule Loop of Henle Reabsorption Urine
Urine Leaves the kidneys Ureters Urinary bladder Urethra
Kidneys Filter 180L of blood a day 1% of body weight Use 25% oxygen of the body
pH Adjusts the acid-base balance Low pH - H+ kidneys will excrete H+ High pH - H+ Kidneys will absorb HCO3-
Summary Lungs, skin, kidneys Remove wastes, carbon dioxide, water and salt Both filtration and reabsorption are important Maintains pH homeostasis