Which of the following correctly describes thalidomide?
A. It is able to cause birth defects only during the first week of pregnancy.
B. It is associated with fetal alcohol syndrome.
C. It is a radioactive mutagen.
D. It is a teratogen.
E. It is a major cause of neural tube defects.
Answer: D
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As carbon dioxide enters systemic blood, it causes more oxygen to dissociate from hemoglobin (the Haldane effect), which in turn allows more CO2 to combine with hemoglobin and more bicarbonate ions to be generated (the Bohr effect)
Indicate whether the statement is true or false
The action of the extensor digitorum longus muscle is to __________.
A. invert the foot B. plantar flex the foot C. extend digits D. flex the digits
The membrane of resting nerve cells is more permeable to ________ ions than ________ ions.
A. potassium, sodium B. sodium, potassium C. calcium, potassium D. chloride, potassium
Identify the characteristics of action potentials. Select all that apply.
-the strength of the stimulus determines the magnitude of the action potential -multiple stimuli can create larger action potentials, and fewer stimuli can create small action potentials. -they are all-or-none -the strength of the stimulus determines the frequency of the action potentials -they are propagated in a non-decremental fashion -they are all or none -the strength of the stimulus determines the frequency of the action potentials. -they are propagated in a non-decremental fashion