During heavy exercise, the ATP requirements of active muscle are likely to be met by metabolism of
A) fatty acids.
B) nucleotides.
C) protein.
D) carbohydrates.
D) carbohydrates.
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The two systems with related functions that will change the most rapidly at birth, but that are still undergoing some differentiation shortly before birth, are the circulatory and ________ systems.
Fill in the blank(s) with the appropriate word(s).
What level of neural input (to motor neurons) involves pyramidal cells?
a. input from the brain stem b. input from the efferent neurons c. input from afferent neurons d. input from the sensory cortex e. input from the primary motor cortex
Which of the following is incorrect about water movement across the membrane?
a. water can only move across the membrane through water channels b. the movement of water is referred to as osmosis c. water can slip between and pass through phospholipid molecules d. water channels are known as aquaporins e. water tends to be attracted to an area with a higher solute concentration
Developing sperm cells are protected by a blood-testis barrier formed by
A. sustentacular cells. B. interstitial spaces. C. leukocytes. D. Leydig cells. E. connective tissue septa.