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homework questions for exam 3
Terms in this set (25)
What causes skeletal muscle relaxation?
Motor neuron does not fire action potentials
If you have a stroke in the right motor cortex that destroys the neurons, what would be the functional consequence?
Left side of body is paralyzed
An Arctic Tern typically flies 44k miles a year during its annual migrations. What kind of muscle fibers likely make up the majority of its wings?
Oxygenated blood from the lungs first enters the heart via which chamber?
What causes the action potential in the pacemaker cells in the SA node?
The action potentials are intrinsically produced by pacemaker cells that express If channels
What causes the AV valves to close?
Ventricular contraction (increasing pressure in ventricles)
Which blood vessels normally carries fully oxygenated blood?
Carotid artery (the artery that brings blood to the brain)
When the atria contract they are in ______, which results in ______.
systole; movement of blood into the ventricles
Which cardiac event during the QRS wave in the ECG?
During diastole, the pressure in the ventricles is much less than in the arteries. If the pressure is greater in the arteries, then why doesn't blood go back into the ventricles?
The semilunar valves close when the pressure in the arteries is greater than in the ventricles
The sympathetic nervous system can increase the stroke volume of the heart. If the stroke volume increases, how will that affect the blood pressure in the aorta?
Increase the systolic pressure
When the sympathetic nervous system is active, ______ will be released onto the smooth muscles surrounding some blood vessels, causing _______, which affects the blood pressure.
What reduces arterial blood pressure?
Implanting a small electrical device on the aortic baroreceptors that caused them to fire more frequent action potentials
What would be an effective medication to treat hypertension?
Ca+2 channel blockers that cause vasodilation
What leads to increased stroke volume?
Increased levels of epinephrine in the blood
If you were to go upside down into a handstand, blood pressure would momentarily increase (until the baroreceptor reflex corrects it). Why does blood pressure increase when you go upside down?
There is increased venous return
Which structure in the respiratory system has the most similar function to the heart? Think about the function of the heart first.
muscles in the chest, and the diaphragm
Which statement is true?
The sympathetic nervous system causes vasoconstriction and bronchodilation
During exercise, the ventilation rate increases. How does that happen? Think about what is actually causing us to breathe.
Increased frequency of action potentials in the motor neurons that control the inspiratory muscles
What are the functions of the sympathetic nervous system?
decreased smooth muscle contraction in the bronchioles, decreased end systolic volume, increased resistance in most arterioles that go to the digestive system, increased cardiac output
What happens to oxygen transport when the body is cold (compared to normal)?
blood in the systemic veins contains more oxygen
Carbon dioxide is not an acid, but it can lower the pH of blood when it is abundant. Why is that?
The majority of carbon dioxide in the blood reacts with water to make bicarbonate and H+ ions
Which statement is correct?
PO2 is greater in the pulmonary vein than in the vena cava
Which molecule is reabsorbed completely back into the blood in the proximal tubule? In other words, this molecule gets filtered into the tubule initially, but is then not found in the tubule beyond the proximal tubule.
What happens when the hormone ADH is present?
Water moves from the duct to the capillary (reabsorption)
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Clicker questions from slides for exam 3
Lec 15 - Reflexes and Motor Control
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