If L = load, F = fulcrum, and E = effort, what type of lever system is described as LEF?

A) first-class lever
B) second-class lever
C) third-class lever
D) fourth-class lever


C) third-class lever

Anatomy & Physiology

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Indicate whether the statement is true or false

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Vitellogenin is a phospholipoprotein produced by the

A) Follicle cells. B) Insect fat body. C) Vertebrate liver. D) All of the above

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How long is the refractory period for men on average after intercourse?

A) men don't have a refractory period B) about 20 seconds C) about 2 minutes D) about 20 minutes E) about 2 hours

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