What electrical event in the heart does the QRS complex represent?
Ventricular repolarization is represented by what part of an ECG?
What ECG wave represents the atrial depolarization?
Why is the ECG event indicating atrial repolarization not seen in an ECG?
It occurs at the same time as ventricular depolarization which is the larger electrical event
What does a heart block do to impulse transmission in the heart?
Slows the impulse in the heart and lengthens the QRS compels of ECG
What effect does fibrillation have on cardiac muscle contraction and on pumping efficiency of heart? Which is more serious-atrial or ventricular fibrillation?
Random contraction in cardiac muscle results in numerous loci of contractions, atria and ventricles could (fine) at different rates which could be antagonistic to each other & reduce efficiency of heart
If myocardial infarct (heart attack) destroyed a portion of the right or left bundle branches what change would you see in an ECG?
Portion of ECG electrically measured events of bundle branches would be altered, would see an increase of time of QRS interval
Blood from the left subclavian artery flows into what vessels as it moves toward the left arm?
Left axillary artery
Blood in the radial artery comes from what blood vessel?
An aneurysm is a weakened, expanded portion of an artery. Ruptured aneurysms can lead to rapid blood loss. Describe the significance of an aortic aneurysm versus a digital artery aneurysm.
The nasal cartilages are made of hyaline cartilage. What functional adaptation does cartilage have over bone in making up the external framework of the nose?
Cartilage maintains shape and is flexible. This is important for keeping breathing passages open but is capable of breathing.
The nasal cavities are separated from each other by what structure?
Three structures make up the nasal septum. What are they?
Perpendicular plate of the ethmoid bone, vomer, and the nasal cartilage
What is the function of respiratory epithelium and the superficial blood vessels in the nasal cavity?
Warm and moisten the external air, prior to it entering the lungs
Name the openings between the nasal cavity and the pharynx.
Internal nares or choanae
What is the name of the space behind the oral cavity and above the laryngopharynx?
What is the name of the structure that prevents fluid from entering the nasopharynx during swallowing?
What is the name of the large cartilage of the anterior larynx?
What is the structure that protects the glottis from fluid entering the larynx?
Which lung has just two lobes in the human?
What membrane attaches directly to the lungs?
The trachea branches into two tubes that go to the lungs. What are these tubes called?
Main or primary branch
Where is the tracheobronchial tree located?
Brachial tubular structure in lungs
What small structure in the lung is the site of oxygen exchange with the blood capillaries?
The surface area of the lungs in humans is about 70 square meters. How can this be so if the lungs are located in the small space of the thoracic cavity? What role do alveoli play in the nature of surface area?
The division of the lungs into many small sacs increases surface area. The surface area can be increased by adding more inner walls to a particular region.
Emphysema is a destruction of the alveoli of the lungs. What effect does this have on the surface area of the lungs?
It breaks down the alveoli which decreases surface area