How do lymphatic capillaries differ form blood capillaries?
A. Lymphatic capillaries do not have a basement membrane.
B. Simple squamous epithelial cells of lymphatics overlap with loose attachments.
C. Lymphatic capillaries are more permeable than blood capillaries.
D. Lymphatic capillary epithelium act as one-way valves preventing movement of fluid back into interstitial spaces.
E. All of the choices are ways lymphatic capillaries differ from blood capillaries.
E
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Muscles exhibit the property of excitability. This means that the muscle
A. excites itself. B. responds to stimulation by the nervous system. C. stretches beyond its normal length. D. recoils to its original resting length. E. shortens its length.
Bone cells called ________ break down bone by secreting hydrochloric acid and enzymes that dissolve the matrix.
A. osteocytes B. osteoprogenitor cells C. osteoblasts D. osteoid cells E. osteoclasts
The apical heartbeat is heard by listening between the fifth and sixth ribs about 7.5 cm left of the midline.
Answer the following statement true (T) or false (F)
You notice that your father holds his book farther from his face than he used to. Since you are taking an anatomy and physiology course, you realize that this is due to
A) his photoreceptors having become less sensitive to light. B) his cataracts. C) a tumor on his optic nerve. D) a lack of vitreous humor in his eyeball's posterior cavity. E) his lens being unable to accommodate for close objects.