When a reversible chemical reaction is at equilibrium,
A. catalysts no longer influence either the forward or reverse reaction rates.
B. the concentration of the reactants is equal to the concentration of the products.
C. the rate of the reaction in one direction is equal to the rate in the reverse direction.
D. both the forward and reverse reactions stop occurring.
E. the supply of reactants has become exhausted, so the forward reaction ceases and the rate of the reverse reaction increases.
Answer: C
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Answer the following statements true (T) or false (F)
1. The soleus is a synergist of the gastrocnemius during plantar flexion. 2. Muscles that help to maintain posture are often called synergists. 3. In order to propel food down to the esophagus, the pharyngeal constrictor muscles are used. 4. Plantar flexion at the ankle joint is accomplished by the tibialis anterior muscle 5. The arrangement of a muscle's fascicles determines its range of motion and power.
The movement of molecules from an area of high concentration to an area of low concentration is known as a. passive diffusion. b. facilitated diffusion
c. active transport. d. pinocytosis/phagocytosis.
Because skeletal muscle cells are so close together, muscle contains very few blood vessels
Indicate whether this statement is true or false.
Thyroid hormones
a. regulate basal metabolic rate b. are released from the thyroid gland immediately after synthesis c. contain chromium and zinc as structural cofactors d. are tropic e. are none of the above