Active immunity is a natural process, whereas passive immunity is generated artificially
Indicate whether this statement is true or false.
FALSE
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To detect the presence of bacterial infections such as chlamydia and gonorrhea, a urine sample is ordered. This makes sense because ________
A) Glomerular filtrate cannot be changed once it leaves the collecting ducts B) Urine from a healthy individual is, otherwise, sterile C) The urethra traps pathogens D) Not enough information provided to determine plausibility.
In the heart of cartilaginous fishes, blood enters the _____ and is returned to the systemic circulation by the _____
a. right atrium; left ventricle b. sinus venosus; conus arteriosus c. sinus arteriosus; conus venosus d. sinus venosus; bulbus arteriosus e. sinus arteriosus; bulbus venosus
Movements permitted by the elbow joint between the humerus and the ulna are
A. movement in any plane. B. rotation and circumduction. C. adduction, flexion, and extension. D. flexion and extension.
Multiple sclerosis (MS) is one of the better known diseases resulting from demyelination of axons (in MS, only CNS axons are affected). Some of the earliest symptoms of the disease are difficulty in focusing the eyes, such as in reading, and difficulty in maintaining balance, and frequently not being able to make adjustments in posture to avoid falling. How do these symptoms "fit" with what you
know about nerve impulses, myelin sheaths, and the location of gated ion channels in the membranes of axons? What will be an ideal response?