Mechanics of Breathing (Pulmonary Ventilation)
Lungs occupy most of the thoracic cavity
The Heart occupies the central portion of the thoracic cavity. What is this
central portion called?
Each lung is divided
Respiratory mucosa: lining of nasal cavity resting on thin-walled veins; functions
to warm the air as it flows past.
Rhinitis: inflammation of the nasal mucosa; results in congestion & post-nasal
Sinusitis: inflammation of sinus cavit
Gas Transport in the Blood
Oxygen transport in the blood
What does oxygen attach to for transport?
Name the form this attachment is called.
Is this the only way oxygen is transported?
Carbon dioxide transport in the blood
Four Events of Respiration-
Types of Body Movements
Decreases the angle of the joint
Brings two bones closer together
Typical of bending hinge joints like knee and elbow or ball-and-socket
joints like the hip
Opposite of flexion
Increases angle between two b
Smooth Muscle Characteristics
Involuntaryno conscious control
Found mainly in the walls of hollow organs
Found in heart wall
Generation of force necessary to pump
Skeletal Muscle Structure
Stimulation and Contraction of Single Skeletal Muscle Cells
Describe the following:
What Initiates Skeletal Muscle Contraction?
Nerve signals initiate the voluntary or invo
Muscle tissue allows for movement
All together comprises 4050% body mass
Limited capacity for regeneration
Comparison of Skeletal, Cardiac, and Smooth Muscles
Oxygen Regenerates ATP
Oxygen replenishes ATP stores that were used to run other reactions in the body
(sped up by increased body heat)
Oxygen speeds heart and breathing muscles using more ATP
Oxygen replenishes ATP used in tissue repair processes
Types of Muscle Contractions
Myofilaments are able to slide past each other during contractions
The muscle shortens and movement occurs
Example: bending the knee; rotating the arm
Tension in the muscles i