57) How is the bulk of carbon dioxide carried in blood? A) as carbonic acid in t

Question

57) How is the bulk of carbon dioxide carried in blood? A) as carbonic acid in the plasma B) as the bicarbonate ion in the plasma after first entering the red blood cells C) chemically combined with the amino acids of hemoglobin as carbaminohemoglobin in the red blood cells D) chemically combined with the heme portion of hemoglobin 58) Which of the choices below determines the direction of respiratory gas movement? A) solubility in water B) the temperature C) partial gradient D) molecular weight and size of the gas molecule 59) Which ion channel opens in response to a change in membrane potential and participates in the generation and conduction of action potentials? A) ligand-gated channel B) voltage-gated channel C) leakage channel D) mechanically gated channel 60) Surfactant helps to prevent the alveoli from colla by A) humidifying the air before it enters B) warming the air before it enters C) interfering with the cohesiveness of water molecules, thereby reducing the surface tension of alveolar fluid D) protecting the surface of alveoli from dehydration and other environmental variations 61) What is the main, general purpose of negative feedback? A) to keep the body's sugar high B) to control all body system tissues C) to maintain homeostasis D) to regulate excretiorn 62) Which of the following is the correct sequence of events for muscle contractions? A) neurotransmitter release, muscle cell action potential, motor neuron action potential, release of calcium ions from SR, sliding of myofilaments, ATP-driven power stroke B) neurotransmitter release, motor neuron action potential, muscle cell action potential, release of calcium ions from SR, ATP-driven power stroke C) muscle cell action potential, neurotransmitter release, ATP-driven power stroke, calcium ion release from SR sliding of myofilaments D) motor neuron action potential, neurotransmitter release, muscle cell action potential, release of calcium ions from SR, ATP-driven power stroke, sliding of

Explanation / Answer

Ans 57) b CO2 mainly move as Bicarbonate ion in plasma

58= c

59)b

60)c

61) c

62) d

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