The cranial nerves that innervate the extrinsic eye muscles are
A) I, II, and III.
B) III, IV, and VI.
C) II, III, and IV.
D) II and VI.
E) III and V.
B
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Which statement regarding the relaxation phase of a muscle twitch is true?
A) The phase begins at stimulation and typically lasts about two milliseconds. B) Muscle tension falls to resting levels. C) The action potential sweeps across the sarcomere during this period. D) Tension rises to a peak. E) Cross-bridges are interacting with active sites on actin filaments throughout this period.
Answer the following statements true (T) or false (F)
1. An electron in the third energy level is closer to the nucleus than an electron in the second energy level. 2. All compounds are molecules, but not all molecules are compounds. 3. The bond between carbon and hydrogen in an organic compound is an example of a covalent bond. 4. Water is the most abundant solute in the body. 5. Chemical bonds can store potential chemical energy.
A patient with hypertension and poorly controlled diabetes complains of frequent urination. She does not take any medications yet for these conditions. What can explain her complaint?
A. Glomerular filtration rate decreases in response to excessive stretch of the glomerular capillaries in hypertension. B. Blood glucose increases the osmotic pressure in the tubules, causing increased urine production. C. Sympathetic stimulation increases when blood pressure increases, which causes dilation of the afferent arterioles. D. Renal autoregulation prevents blood glucose from entering the filtrate, but the pressure in the glomerulus increases filtrate production.
When a muscle spanning a joint contracts, it pulls the ________ toward the ________.
A. smaller bone; larger bone B. insertion; origin C. larger bone; smaller bone D. origin; insertion