1 11 intro to respiratory systemPresentation Transcript
Last time…promise….Describe the journey of blood throughout the fourchambers of the heart and the different circulations
Do Now (extended)What’s the difference betweenarteries, capillaries, and veins?
Regents Review Humans breathe more rapidly during exercise than before it because during exercise the blood contains1. an increased level of oxygen2. a decreased number of red blood cells3. an increased level of carbon dioxide4. a decreased amount of hemoglobin
Objective: What are the structures and functions of the respiratory system?
Why do medics first check forbreathing when they treat a patient? All cells in our body require CONSTANT oxygen supply For respiration! Respiratory system works with circulatory system to deliver oxygen Interruption of this can be fatal – tissues die fast
Function of the respiratory system Respiration in the Respiratory System – process of gas exchange between a body and the environment System picks up oxygen from air we inhale and releases carbon dioxide into air we exhale Identify the cellular organelle that performs a similar function.
Here’s a question…Compare the differences between respiration andcellular respiration in cells.
Structures of the respiratory system: The Nose Passageway for air transport into delicate tissues Lung tissue must be kept healthy Hairs in nasal passage filters air and traps large particles Air is warmed by inner nasal cavity and sinuses
Regents Review Which statement best describes the human respiratory system?1. It is composed of a network of moist passageways that permit air to flow from the external environment to the lungs.2. Each cell of the human body is in direct contact with the external environment, and gas exchange occurs by diffusion3. The external body surface is kept moist to allow for gas exchange.4. Gases diffuse across membranes on both the external and internal surfaces of the body.
Structures of the respiratory system: The Pharynx Air moves from nose to PHARYNX – aka the throat Passage for both air and food
Structures of the respiratory system: The Larynx Contains the vocal cords Manipulates air that passes through and creates sound
Structures of the respiratory system: The Trachea The “wind pipe” – connects pharynx to lungs Mucus produced in trachea traps inhaled particles Kept opened by cartilage rings surrounding tissue Trachea covered by the epiglottis when swallowing food
Structures of the respiratory system: The Trachea CILIA – short hair-like projections that produce movement Push mucus and trapped particles toward pharynx (why?) Swallow or cough up this “stuff”
Regents Review The respiratory system includes a layer of cells in the air passages that clean the air before it gets to the lungs. This layer of cells is best classified as1. a tissue2. an organ3. an organelle4. an organ system
Structures of the respiratory system: The Lungs After trachea, air moves into Bronchi (bronchus) Connects trachea to each lung
Structures of the respiratory system: The Lungs Inside lung, the path branches 1. Bronchus divides into smaller bronchi 2. Bronchi branches into smaller bronchioles 3. Bronchioles divide into ALVEOLI (alveolus) Bronchi/bronchioles surrounded by muscle and air passages can expand or contract…
*****Alveoli (Alveolus) *functional unit of lungsMillions of tiny air sacs in lungsGroups in clusters; surrounded by capillaries Where gas exchange actually occurs (Predict structure)
Regents Review The human trachea is prevented from collapsing by the presence of1. mucous membranes2. cartilaginous rings3. muscle fibers4. bony networks
Regents Review Diagrams A and B represent structures found in the human body. Diagram B represents the functional unit of which structure represented in diagram A?1. structure 12. structure 23. structure 34. structure 4
Regents Review Which statement correctly describes the exchange of gases at the alveoli?1. Oxygen is exchanged evenly from the blood to the alveoli2. Carbon dioxide is exchanged evenly from the blood to the alveoli3. Oxygen moves from the blood to the alveoli and carbon dioxide moves from the alveoli to the blood4. Oxygen moves from the alveoli to the blood and carbon dioxide moves from the blood to the alveoli