What cell type is the last stage of erythrocyte production prior to development of a mature erythrocyte?
A) reticulocyte
B) megakaryocyte
C) monocyte
D) myeloid stem cell
E) lymphoid stem cell
Ans: A) reticulocyte
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The ________ is a comma-shaped structure that lies on the surface of the testis, and includes a head, body, and tail.
Fill in the blank(s) with the appropriate word(s).
Which of the following descriptions of a preganglionic neuron is NOT correct?
a) Has axons that exit the CNS in a cranial or spinal nerve. b) Has myelinated axons. c) Forms the first part of an autonomic motor pathway. d) Has its cell body in the brain or spinal cord. e) Forms gap junctions with postganglionic neurons in autonomic ganglia.
Answer the following statements true (T) or false (F)
1. Chronic release of excess thyroxine can cause a sustained increase in heart rate and a weakened heart. 2. Arterial blood supply to heart muscle is continuous whether the heart is in systole or diastole. 3. Trabeculae carneae are found in the ventricles and never the atria. 4. The "lub" sounds of the heart are valuable in diagnosis because they provide information about the function of the heart's pulmonary and aortic valves. 5. Autonomic regulation of heart rate is via two reflex centers found in the pons.
_______ Tissue is highly vascular, whereas _______________ is not.
A) Epithelial; cartilage. B) Muscular; osseous tissue. C) Dense regular connective; dense irregular connective tissue. D) Areolar; cartilage. E) Nervous; osseous tissue.