hack.diversity View Assessment Document Your one-time code - ptemea13 New Tab blackboard.middlesex.mass.edu/ultra/courses/_129156_1/outline/assessment/_4537054_1/overview/attempt/_8920347_1?courseId=_129156_1 81 minutes remaining 23 OF 68 QUESTIONS REMAINING Which one of the following describes a state of hypokalemia? A excess calcium increasing heart irritability leading to spastic heart contractions B increase in potassium interfering with depolarization by lowering resting potential C decrease in potassium causing the heart to develop an arrhythmic beat D decrease in calcium depressing the heart contraction Question 47 1 Point Which one of the following terms refers to a decrease in calcium levels which might cause a depression of heart contraction? A hypocalcemia B hypokalemia C hypercalcemia D hyperkalemia Question 48 1 Point There are three tunics (layers) found in arteries and veins. Which tunic is comprised mostly of smooth muscle and elastin? A tunica interna B tunica media C tunica externa
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Madhur L.
If the membranes of the cardiac muscle cells in the SA node become more permeable to potassium ions, A. the heart rate will decrease B. the heart rate will increase C. the membrane will depolarize D. the stroke volume will increase E. the intracellular concentration of potassium ions will increase QUESTION 6 Excitation-contraction coupling in the heart differs from E-C coupling in skeletal muscle in that A. in cardiac cells there is a delay in the uptake of Ca2+ into the SR during depolarization B. in cardiac cells there is no lag between phase 0 depolarization and peak contractile activity C. in the heart, ryanodine receptors are not directly coupled to the T-tubule, being triggered instead by Ca2+ entry D. in the heart, the contractile cells have more than one motor unit per cell QUESTION 7 Pick the item on the right that best describes the blood vessels listed. Use each option only once. A. Venule - where white blood cells leave the circulation and enter the tissue B. Vein - large capacity to expand when intravascular capillary hydrostatic pressure rises C. Arteriole - principal site of molecular diffusion between blood and interstitium D. Artery - the primary controller of blood flow to tissues E. Its elastic recoil maintains blood flow during diastole QUESTION 8 A certain drug decreases heart rate by producing hyperpolarization in the pacemaker cells of the heart. This drug probably binds to A. beta receptors B. alpha adrenergic receptors C. gamma receptors
Adi S.
Which of the following cardiac tissues has the most rapid conduction velocity? Select one: a. SA node b. Atrial muscle c. AV node d. Purkinje fibers Pancreatic juice contains all the following enzymes except. Select one: a. Trypsin b. Lipase c. Pepsin d. Nuclease The binding of Ca2+ to... starts the contraction cycle of the sarcomere. Select one: a. Tropomyosin b. ATP c. Troponin d. Actin The disaccharide lactose consists of. Select one: a. Glucose and galactose b. Fructose and glucose c. Galactose and fructose d. Glucose and galactose Which of the following contains only actin filament? Select one: a. A band b. H band c. I band d. Z line The deoxygenated blood leaves the through the... Select one: a. Left atrium/aorta b. Left ventricle/aorta c. Right atrium/pulmonary trunk d. Right ventricle/pulmonary trunk
Hem S.
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