List and describe the types of contractile and regulatory proteins found in a thin filament
What will be an ideal response?
A thin filament is composed of actin, tropomyosin, and troponin. Actin is a contractile protein. Actin has an area known as an active site that can bind a myosin head. Strings of actin molecules form the largest part of the thin filament. Tropomyosin is a regulatory protein that spirals around the actin strands and covers the active sites. Troponin is a second regulatory protein that holds tropomyosin in place and binds a calcium ion.
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Two prominent tendons you can palpate at the popliteal fossa arise from which muscles?
A. The adductor magnus and biceps femoris B. The pectoralis major and latissimus dorsi C. The teres major and triceps brachii D. The semitendinosus and biceps femoris E. The sartorius and gracilis
Which of the following most accurately describes the renal transport of Na+?
A. Most of the Na+ transport occurs in the distal convoluted tubule and collecting ducts. B. Primary active transport of Na+ allows for secondary active transport of glucose and H+ in the proximal tubule. C. Na+ is actively transported across the luminal membrane of proximal tubule cells in exchange for K+, by Na+/K+ ATPase pumps. D. Na+ is actively secreted into the nephron lumen by cells in the cortical collecting ducts. E. Na+ is actively transported in all segments of the tubule.
In the following enhanced CT scan of the abdomen, the arrow points to the:
A) spleen. B) liver. C) stomach. D) left kidney. E) inferior lobe of the left lung.
Select the function not characteristic of the hypothalamus
a. body temperature control. b. coordination center with the autonomic nervous system. c. food intake control. d. production of posterior pituitary hormones. e. sensory inputs from skeletal muscles.