Doctor Johansson wants to test a patient's reflexes by briskly striking the patellar tendon with a reflex hammer. Which reflex is Dr. Johansson testing?
A. the Golgi tendon reflex.
B. the withdrawal reflex.
C.
the knee-jerk reflex.
D. the crossed extensor reflex.
E. reciprocal innervation.
C
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The longitudinal growth of long bones ceases when
A. chondroblasts take over mitosis of osteoblasts. B. the epiphyseal plate is completely replaced with bone tissue. C. the periosteum is completed. D. the epiphysis becomes separated from the diaphysis. E. the bone marrow forms.
Lymphocytes respond only to antigens that have been processed and presented to them by
a. neutrophils. b. eosinophils. c. macrophages. d. helper T cells. e. interleukin 2.
Which of the following is false regarding unsaturated fatty acids?
A. All of their hydrogen ions are occupied in double bonds. B. They contain one or more double bonds. C. They can be formed from nuts and other plants. D. They are found in cooking oil rather than a stick of butter.
Erection and ejaculation can be initiated by
A. impulses from the cerebellum. B. increased levels of LH and FSH. C. contraction of smooth muscle. D. increased blood levels of testosterone. E. manual stimulation of the penis.