During exercise, which of the following would occur on an electrocardiogram (ECG) compared to an individual at rest?
A) the T wave would decrease
B) the P-R interval would decrease
C) the S-T segment would decrease
D) the time from one R to the R of the next heartbeat would decrease
D
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Lipid-soluble hormones, such as progesterone, exert their effects by forming hormone-receptor complexes that
A. activate a G protein and second-messenger cascade. B. bind to DNA and initiate transcription. C. open ion channels in the cell membrane. D. activate adenylate cyclase.
When someone is given epidural anesthesia near their spinal cord, the drug is delivered in the space between
A. the central canal and the dura mater. B. the dura mater and the arachnoid mater. C. the dura mater and a vertebra. D. the epithelium of the dura and the pia mater. E. a vertebra and its periosteum.
Which embryonic layer gives rise to the lamina propria and muscularis externa?
A. Endoderm B. Gastric tube C. Mesoderm D. Ectoderm E. Neural crest
Answer the following questions true (T) or false (F)
1. The two groups of bones in the skull are the cranial bones, which encase the brain, and the facial bones, which form the framework of the face. 2. Fourteen cranial bones and 8 facial bones form the skull. 3. Fontanels are places where ossification has not yet completed in the skull of a child are often called "soft spots" in those under age 2.