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BMS 300 practice test
Terms in this set (28)
The greatest drop in the oxygen concentration in blood occurs
across the capillaries between the arterioles and the veins
Most if the blood flow through the capillary beds of the myocardium occurs when the _______ is open
right and left atrioventricular valve
Which of the following would be expected to increase blood flow in the capillary beds in the ventricular myocardium
An increase in the pressure that closes the aortic valve
Papillary muscles are specialized muscles in the ventricles that are attached to the atrioventricular valves and ensure that these valves remain closed during systole. You would expect these muscles to be contracted:
during the ventricular contraction phase
To increase cardiac output, the sympathetic branch of the autonomic nervous system _______ in conductile cardiomyocytes.
increases the rate of NA+ influx
The parasympathetic branch of the autonomic nervous system affects cardiac output by:
decreasing heart rate
Blood in the ventricle that is destined for the pulmonary capillary beds is in contact with the:
endothelial cells of the endocardium
Contractile cardiomyocytes and skeletal muscle fibers perform similar functions. Which of the following statements is NOT true?
Voltage-gated sodium channels present in skeletal myocytes are absent from contractile cardiomyocytes.
In the accompanying electrocardiogram, action potentials propagate through the bundle branches and Purkinje fibers during:
Assuming that the pressure difference between two ends of an arteriole remains unchanged, relaxing its smooth muscle would ___________ the flow. If the relaxation increased the radius by two times, the change in flow would be _____ times.
The action potential in the accompanying diagram would be initiated when gap junctions in the _____________ pass current to __________________.
Purkinje fibers, contractile cardiomyocytes of the ventricle
The neurons that make synapses in the diaphragm have their cell bodies in the _________, and release the neurotransmitter __________________ which binds to______________.
b.ventral horn of the spinal cord, acetylcholine, nicotinic acetylcholine receptors
In the lung, smooth muscle is found around the _________. During an asthmatic response to allergens histamine is released. When this smooth muscle binds histamine, the muscles ______ to _____ the resistance to air flow is.
bronchioles, contract, increase
The Bohr effect occurs when H+ ions bind to amino acids in hemoglobin and is most pronounced in __________ where the ___ is higher than ____________.
the tissues, PCO2, in the lung
As erythrocytes move through capillaries in active muscle, the role of carbonic anhydrase is predominately to speed up generation of:
HCO3- and H+ from CO2 and H2O.
The peripheral chemosensors that can affect breathing rate monitor CO2 and O2 in ________ blood.
By decreasing the surface tension, surfactant (detergent):
increases lung compliance &
decreases lung elastic recoil
During quiet inspiration, the urge to breathe comes largely from:
the H+ concentration in the cerebral spinal fluid in the brain stem.
In emphysema, the elastic recoil of the lungs is drastically reduced. The effect of this disease is to hamper:
When blood is put in a centrifuge and spun, the antibodies generated by plasma B lymphocytes are found almost entirely in the:
In the process of lymph production water returns to the blood on the venous side of the capillaries because:
the protein concentration in the blood capillaries on the venous side is greater than in the protein concentration in the extracellular spaces around the cells (the interstitial fluid).
Each mature Memory B lymphocyte:
1. arises from a single ancestral cell that produced a randomly selected antibody . &
2. expresses antibodies as transmembrane proteins
The lymphatic tissues most commonly associated with the basilar region of an epithelium of the pharynx or intestine are the:
Tonsils and Peyer's patches.
Soon after macrophages begin disseminating the virus you expect to see endothelial cells and hepatocytes generating elevated amounts of:
Based on our discussion of influenza viruses, you would expect vaccine producers to generate antigens that are part of:
the GP protein
The viruses' ability to decrease MHC I production would affect:
1. generation of the cellular immune response
2. reduce the display of Ebola viral fragments on cell surfaces of infected cells
There may be individuals in the general population who have never been exposed to the disease, but who are immune to the Ebola virus. You would expect these individuals to have a variant of the ____________ protein.
the NPC1 protein
The hemorrhagic effect of the disease most likely results from the disruption of _______________ in ________________.
integrins, endothelial cells
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