A cell can increase how fast a substance diffuses across its plasma membrane by inserting channels, which modify the
A) distance across the membrane.
B) concentration gradient of the substance.
C) size and mobility of the substance.
D) membrane's permeability to the substance.
E) charge of the substance.
D
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When a cell is at its resting membrane potential, more potassium diffuses out than sodium diffuses in.
Answer the following statement true (T) or false (F)
A woman insists on an ultrasound and a maternal serum marker test to check for Trisomy 21 in her unborn child because she only wants to use non-invasive methods. Her obstetrician will
A. allow the maternal serum marker test but still recommend amniocentesis, because maternal serum markers and amniocentesis check chromosomes while ultrasound and CVS do not. B. heavily advise against this decision, because ultrasound and maternal serum markers do not check chromosomes while CVS and amniocentesis do. C. follow the procedures she wants, because ultrasound and maternal serum markers check chromosomes while CVS and amniocentesis do not. D. allow the ultrasound but still recommend CVS, because ultrasound and CVS check chromosomes while maternal serum markers and amniocentesis do not.
An injection of a local anesthetic into the spinal column is called a(n) ________.
A. epiphysis B. epidural C. subdural D. cutaneous
Which of the following is not considered a reproductive duct of the male reproductive system?
a. epididymis b. vas deferens c. seminiferous tubule d. urethra