Chapter 10, Problem 6SC

In a general sense, how do skeletal muscles produce movement?

Some nutritionists claim that the secret to long life is to be slightly underweight as an adult. If a persons weight is related partly to diet, partly to activity level, and partly to genetics, what underlying factors could be at work to generate statistics that support this claim?

Basal metabolic rate is a measure of ______. a. the total amount of calories you burn in 24 hours b. the amount of food energy needed to sustain basic body operations c. the amount of energy burned by skeletal muscle in a given period d. both a and b

What is the function of the sarcoplasmic reticulum in muscle cell contraction?

Figure 38.37 Which of the following statements about muscle contraction is true? The power stroke occurs when ATP is hydrolyzed to ADP and phosphate. The power stroke occurs when ADP and phosphate dissociate from the myosin head. The power stroke occurs when ADP and phosphate dissociate from the actin active site. The power stroke occurs when Ca2+ binds the calcium head.

Cheetahs and human sprinters tend to have a high proportion of ________fibers in their leg muscles. a. white b. fast red c. slow red

The hormone insulin enhances the transport of glucose (sugar) from the blood into most body cells. Its secretion is controlled by a negative-feedback system between the concentration of glucose in the blood and the insulin-secreting cells. Therefore, which of the following statements is correct? A decrease in blood glucose concentration stimulates insulin secretion, which in turn further towers blood glucose concentration. An increase in blood glucose concentration stimulates insulin secretion, which in turn lowers blood glucose concentration. A decrease in blood glucose concentration stimulates insulin secretion, which in turn increases blood glucose concentration. An increase in blood glucose concentration stimulates insulin secretion, which in turn further increases blood glucose concentration. None of the preceding is correct.

After you eat too many carbohydrates and proteins, your body converts the excess to storage fats, which accumulate in.____________. a. loose connective tissue b. . dense connective tissue c. adipose tissue d. both b and c

Which arrangement best describes a bipennate muscle? The muscle fibers feed in on an angle to a long tendon from both sides. The muscle fibers feed in on an angle to a long tendon horn all directions. The muscle fibers feed in on an angle to a long tendon horn one side. The muscle fibers on one side of a tendon feed into it at a certain angle and muscle fibers on the other side of the tendon feed into it at the opposite angle.