Unit 9 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 bronchioles Alveoli diaphragm

Path of Air Nasal passages pharynx larynx epiglottis, trachea, lungs 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 (CO 2) 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 p. H

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 180 L of blood a day 1% of body weight Use 25% oxygen of the body

p. H Adjusts the acid-base balance Low p. H High p. H - H+ H+ kidneys will excrete H+ Kidneys will absorb HCO 3 -

Summary Lungs, skin, kidneys Remove wastes, carbon dioxide, water and salt Both filtration and reabsorption are important Maintains p. H homeostasis