Large veins, medium veins, and venules have valves to prevent the backflow of blood.
Answer the following statement true (T) or false (F)
False
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The integumentary system is protected by the action of cells that arise from bone marrow and migrate to the epidermis. Which of the following cells serve this function?
A) cells found in the stratum spinosum B) macrophages called epidermal dendritic cells C) keratinocytes, because they are so versatile D) tactile cells
Answer the following statement(s) true (T) or false (F)
1. The spinal cord controls some ANS responses, particularly visceral reflexes. 2. Pre- and postganglionic neurons develop from the embryonic neural tube. 3. The autonomic nervous system carries out many somatic reflexes that are crucial to homeostasis. 4. Under normal circumstances, both divisions of the autonomic nervous system are active simultaneously. 5. Most autonomic efferent pathways involve one neuron.
When a normal number of erythrocytes are simply concentrated in a smaller plasma volume, the condition is sometimes termed __________
Fill in the blank(s) with correct word
Which common metabolic disease presents with irregular thickening and softening of the bones?
a. gigantism b. Paget's disease c. osteoporosis d. rickets