Large-diameter, densely packed myofibrils, large glycogen reserves, and few mitochondria are characteristics of
A) slow fibers.
B) intermediate fibers.
C) fast fibers.
D) red muscles.
E) fatty muscles.
Answer: C
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Which of the following characteristics of life and their descriptions are correct?
A) Assimilation—sensing changes inside or outside the body and reacting to them B) Circulation—the movement of substances in body fluids C) Responsiveness—obtaining and using oxygen to release energy from food D) Respiration—changing absorbed substances into forms that are chemically different from those that entered the body fluids
Answer the following statements true (T) or false (F)
1. Of the 180 liters of water filtered out of the blood every day, about 150 liters are reabsorbed. 2. In a healthy kidney, almost no glucose is lost in the urine. 3. Glycosuria is symptomatic of diabetes mellitus. 4. Sodium ions are returned to the blood primarily by active transport. 5. Secretion moves hydrogen ions from the filtrate to the blood whereas active transport moves hydrogen ions from the blood to the filtrate.
What is tropomyosin?
A. A protein found along the groove of the F-actin double helix B. After exercise, the O2 taken in that exceeds the O2 required for resting metabolism C. The combination of myosin heads with active sites on actin molecules D. The movement of myosin head while attached to actin myofilament E. A T tubule and two adjacent terminal cisternae
Calculate the area in blue. All numbers are in centimeters (cm). If you need help, scan the QR code in the upper right corner on the opposite page
A) 5.12 square centimeters B) 10.24 square centimeters C) 20.48 square centimeters D) 64 square centimeters E) 96 square centimeters