Calcium-induced calcium release occurs when
A.
calcium from the sarcoplasmic reticulum stimulates the movement of calcium into the cell through the plasma membrane.
B.
calcium is released from both the sarcoplasmic reticulum and the cardiac muscle cell.
C.
the eflux of calcium from the cell results in depolarization.
D.
calcium entering through the plasma membrane stimulates release of calcium from the sarcoplasmic reticulum.
D
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Which of the following is the correct sequence of events for muscle contractions?
What will be an ideal response? A) motor neuron action potential, neurotransmitter release, muscle cell action potential, release of calcium ions from SR, ATP-driven power stroke, sliding of myofilaments B) neurotransmitter release, muscle cell action potential, motor neuron action potential, release of calcium ions from SR, sliding of myofilaments, ATP-driven power stroke C) muscle cell action potential, neurotransmitter release, ATP-driven power stroke, calcium ion release from SR, sliding of myofilaments D) neurotransmitter release, motor neuron action potential, muscle cell action potential, release of calcium ions from SR, ATP-driven power stroke
Which of the following statements about excitation-contraction coupling is incorrect?
A) Calcium ions travel through the transverse tubule. B) Calcium ion is released from the sarcoplasmic reticulum. C) Tropomyosin moves to expose myosin binding sites on actin. D) Troponin binds calcium ion and signals tropomyosin to move. E) Relaxation requires uptake of calcium ion by the sarcoplasmic reticulum.
Which of the following is a protein-digesting enzyme?
A) amylase B) pepsinogen C) pancreatic lipase D) None of the listed responses is correct.
The lymphatic system is involved in
A. protein metabolism. B. lipid absorption from the digestive tract. C. production of erythrocytes. D. maintenance of pH in the tissues. E. transporting lymph from the intestines to the liver.