Explain why the QRS wave on an electrocardiogram (ECG) is normally larger than a P wave
What will be an ideal response?
The QRS wave on an electrocardiogram is normally much larger in magnitude than the P wave because of the size differences between the atria and ventricles. The ventricles have greater cardiac muscle mass than the atria. Thus, the amplitude of their respective depolarizations correlates to their sizes.
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The skin tans in response to sunlight because of the release of ________.
A. keratin B. melanin C. sebum D. collagen
Which portion of the spinal cord contains the cell bodies of somatic motor neurons and motor nuclei?
a) B b) C c) D d) H e) I
What are the attachments of the gastrocnemius?
a. Posterior tibia and fibula to the calcaneus via the calcaneal tendon b. Proximal lateral fibula to the medial foot c. Medial and lateral femoral condyles to the calcaneus via the calcaneal tendon d. Distal posterolateral femur to the calcaneus
The Peyer patches in the wall of the small intestine are
A. pools of venous blood. B. clusters of lacteals. C. extensive capillary beds. D. nodules of lymphatic tissue. E. nerve plexuses.