When is a conceptus considered to be an embryo?
A. When the egg is fertilized by the sperm
B. When the trophoblast and embryoblast have differentiated from each other
C. As soon as the first traces of all the organ systems are present
D. After the conceptus has implanted in the uterine wall
E. When the three primary germ layers have formed
E. When the three primary germ layers have formed
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A dermatologist recommended a soothing waterproof ointment to be applied directly to a baby's skin. Which kind of medicine delivery did she prescribe?
A) Sublingual B) Transdermal C) Subcutaneous D) Topical
Select the correct definition about tissue grafts.
A) Isografts are between identical twins. B) Allografts are between different species. C) Xenografts are between individuals of the same species. D) Autografts are between two genetically identical individuals.
The fibrous joints between the flat bones of the skull are sutures
Indicate whether the statement is true or false
Which of the following statements concerning the cardiac cycle is true?
A. Blood enters the right and left atria only during diastole. B. During ventricular systole, the AV valves open. C. The semilunar valves remain closed throughout ventricular systole. D. Most of end-diastolic volume comes from active filling. E. Most ventricular filling occurs before the atria contract.