A woman with a 28-day menstrual cycle would like to avoid pregnancy without the use of contraceptives. She should avoid sexual intercourse ________ for the best chance of preventing pregnancy.
A. on days 7-10
B. when basal body temperature is lowest
C. 2 days after start of the secretory phase
D. 1 day prior to her LH surge
Answer: D
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Which property of water is demonstrated when we sweat?
A) high heat capacity B) high heat of vaporization C) polar solvent properties D) reactivity E) cushioning
What term is used to describe a suspension of one liquid in another?
a) solvent b) emulsion c) solution d) mixture
A child ingested an organophosphate poison used to kill insects. Soon the child's muscles began spastic contractions. Predict what occurred at the synaptic cleft.
A. Binding of the poison to acetylcholine receptors leading to inhibition of stimulation B. Both increased accumulation of acetylcholine in the synapse and increased breakdown of acetylcholine in the synaptic cleft are correct. C. Decreased release of acetylcholine from presynaptic neurons D. Increased accumulation of acetylcholine in the synapse E. Increased breakdown of acetylcholine in the synaptic cleft
Which statement is incorrect regarding reflexes?
A. The responses of reflexes are always predictable. B. Both the brain and spinal cord are always involved in any types of the reflexes. C. Effectors are always involved in the reflexes. D. The responses of reflexes are always rapid. E. The responses of reflexes are always involuntary.