Which of the following is NOT a potential filtration barrier in the glomerular capsule?
A. Glomerular basement membrane
B. Slit diaphragm
C. Capillary fenestrae
D. Parietal layer of the capsule
Answer: D
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Which of the following is one of the steps that ends a contraction?
A) Sarcoplasmic reticulum absorbs sodium ions. B) Acetylcholine binds to receptors on the sarcolemma. C) Calcium ions bind to troponin. D) Acetylcholine is broken down by acetylcholinesterase. E) An action potential spreads across the entire surface of the muscle fiber.
Which of the following visceral reflexes is not coordinated by the medulla oblongata?
A) swallowing reflex B) baroreceptor reflex C) coughing reflex D) cardioacceleratory reflex E) pupillary reflex
In the first few seconds of skeletal muscle contraction, what is the main mechanism by which ATP is replenished?
A. Energy and phosphate are transferred from creatine phosphate to ADP. B. Oxidative phosphorylation rapidly generates ATP from glucose. C. Glycolysis produces ATP from glycogen. D. Oxidation of fatty acids into ATP occurs in the mitochondria. E. Myoglobin catalysis produces ATP.
Which hormone ultimately stimulates the activity of osteoclasts and promotes increased calcium absorption in the digestive tract?
A. Triiodothyronine B. Calcitonin C. Parathyroid hormone (PTH) D. Growth hormone (GH) E. Somatostatin