Bio 203 Lab Ch. 12
Terms in this set (25)
The three pairs of cerebral arteries include the ___________ which supplies the lateral surface of the parietal and____________ lobes, the anterior cerebral which supplies the __________ and ___________ lobes, and the ___________ which supplies the medial surface of the temporal and __________ lobes.
The molecule responsible for carrying oxygen to the body is________. It is in ______________ and contains the element ________.
red blood cells
In which of the following is mean blood pressure highest?
which of the following blood vessels is LEAST elastic
inferior vena cava
If the blood in the pulmonary veins contains 18ml of oxygen per 100 ml, where in the heart do we also find blood with the same oxygen content?
When the sympathetic autonomic nervous system is stimulated, what effect does it have on the heart?
- increase force of contraction
- increase rate
The process whereby the crystalline lens is adjusted to form a clear image on the retina for objects at varying distances is called
there are three arteries that deliver blood directly to the circle of willis in the brain. there are two _________ arteries and one ________ artery.
list the three layers found in the walls of arteries. List them from innermost to outermost
the head and neck regions are drained by the internal and external _______ veins, and they empty into the ___________ veins.
True statements abut arteries and veins
- arteries are under high pressure, veins are lower pressure
- pulmonary arteries carry blood away from the heart; pulmonary veins carry it to the heart
- systemic arteries carry oxygenated blood; systemic veins carry deoxygenated blood
when the parasympathetic autonomic nervous system is stimulated, what effect does it have on the heart?
binds to alpha- and beta-adrenergic receptors in the plasma membranes of target cells
- a beta-adrenergic receptor blocker - "beta-blockers"
- used to treat a variety of heart conditions
parasympathetic neurotransmitter that binds to nicotinic and muscarinic receptors in the plasma membranes of target cells
muscarinic receptro blocker
calcium channel blocker that reduces calcium entry into cardiac muscle cells during the plateau phase of the cardiac action potential
component of digitalis; inhibits the sodium-potassium ATP-ase, boosting intracellular calcium and increasing myocardial contractility in a failing heart
alpha-adrenergic receptor blocker
neurotransmitter released by sympathetic post ganglionic nerve terminals in the heart
the sympathetic nervous system increases heart rate,while the parasympathetic nervous system decreases heart rate
the sympathetic nervous system also increases myocardial contractility causing the heart to beat more forcefully and reducing the end-systolic volume
important role in the contraction of the cardiac muscle
1. filling (diastole)
2. atrial systole (topping off-full)
3. onset of ventricular systole: isovolumic ventricular contraction (ventricles contract)
4. ejection (blood ejects and falls then ventricular diastole reoccurs)
5. isovolumic relaxation (all four valves closed, blood is flowing neither into or out of ventricles)
6. onset of filling (stage 1) (reduced filling = diastasis)
four factors that determine blood pressure (BP = mean systemic arterial blood pressure)
1. cardiac output ( CO = SV x HR)
2. total peripheral resistance (determined by vasoconstriction and vasodilation) (MAP = CO x TPR)
3. capacity of venous system (affected by the venous constriction and dilation)
4. volume of fluid in the circulatory system (reduced by hemorrhage, increased by antidiuretics)
OTHER SETS BY THIS CREATOR
Bio 204 Ch.1
Bio 203 Lab Ch. 13
Bio 203 Lab Ch. 11