Exsc 463 - Study guides, Class notes & Summaries

Which of the following athletes would perform best during an upcoming endurance event (e.g. marathon)? A. Bob weighs 80 kg and has a VO2max of 4.0 L/min. B. Bill weighs 75 kg and has a VO2max of 3.75 L/min C. Matt weighs 65 kg, has VO2max of 4.0 L/min and a LT equivalent to 75% of his VO2max. D. Micah weighs 75 kg, has a VO2max of 4.8 L/min and a LT equivalent to 70% of his VO2max. 121 - ANSWER C. Matt weighs 65 kg, has VO2max of 4.0 L/min and a LT equivalent to 75% of his VO2max.

neurotransmitter binds to a receptor and causes an excitatory response. In this example, the cell membrane will _____. - ANSWER hypopolarize Normal contractions of intact whole skeletal muscle _____. - ANSWER are tetanic in nature Adrenergic receptors (alpha and beta) bind with _____. - ANSWER NE and EPI

Skeletal muscle glycogenolysis helps maintain blood glucose levels. True False 140 - ANSWER False Which of the following would increase activity of a rate limiting enzyme during exercise? A. An increase in pH. B. A decrease in pH. C. An increase in NE and EPI. D. An increase in PCO2. E. A decrease in PO2. F. D and E G. B, C, D and E - ANSWER B. A decrease in pH????????????????

After glucose enters the skeletal muscle cell and is phosphorylated, what what two things can then happen to it - ANSWER 1. Undergo Glycolysis - Brokendown to Pyruvate 2. Undergo Glycogenesis - Stored as Glycogen Where is glycogen store in the body - ANSWER - Liver -Skeletal Muscle Difference between: a) glycogen stored in the liver and b) glycogen stored in skeletal muscle - ANSWER a) can undergo glycogenolysis and be transported from the liver to maintain blood glucose levels b) Canno...

What is the purpose of exercise of an exercise program? - ANSWER to promote good health & functional independence Name the five components of health-related physical fitness. - ANSWER cardiorespiratory fitness muscle strength muscle endurance joint flexibility body composition

Following the lipolysis of triglycerides in adipose tissue, _____. - ANSWER the fatty acids enter the muscle cells and are metabolized to form ATP and most of the glycerol is transported to the liver where it is converted to glucose The lipolysis of a triglyceride in adipose tissue results in _____. - ANSWER the formation of three fatty acids and one glycerol

Which of the following receptors is found at skeletal muscle? - ANSWER nicotinic Which statement is true of preganglionic motor neurons? - ANSWER They always excite the postganglionic motor neurons. Which of the following statements is true about the activity of an organ of the autonomic nervous system that has dual innervation (such as the heart)? - ANSWER Its activity at rest or during exercise is related to the net stimulation, or sum of both sympathetic and parasympathetic nervous syst...

What releases ACh from its synapse? - ANSWER Preganglionic sympathetic and parasympathetic neurons, postganglionic parasympathetic motor neurons, postganglionic sympathetic neurons of SWEAT GLANDS, and Preganglionic sympathetic neurons at adrenal medulla to stimulate the release of NE/EPI What receptors are found on cells responding to somatic neurons? - ANSWER Nicotinic What receptors are found at preganglionic parasympathetic neurons? - ANSWER Nicotinic

Describe specifically what happens at the SA node and AV node in order to increase HR during exercise. Why is the dromotropic effect at the AV node necessary to increase or decrease HR? - ANSWER neural stimulation of the SA node affects the frequency of action potentials emitted from the SA node, through the internodal tracts and into the AV node. neural stimulation of the AV node affects the rate of conduction though the AV node Both need to be increased (SS) or decreased (PS) to increase...

Which type of muscle has neural innervation of every muscle cell or fiber? A. Cardiac muscle B. Smooth muscle C. Skeletal muscle - ANSWER C. Skeletal muscle