What is a feature of alveoli? A. They occur in all animals because they are needed for gas exchange. B. They have a higher oxygen concentration than air in the atmosphere to increase the rate of diffusion. C. They have walls that are one cell thick for faster diffusion. D. They are small so keep the gases inside them more concentrated. Markscheme C 61. [1 mark] What is a characteristic of axons in motor neurons? A. When there is a resting potential, the outside of the axon is negative relative to the inside. B. During an action potential, Na ions diffuse out of the axon. C. K ions diffusing out of the axon repolarizes it. D. Impulses in the axon travel towards the cell body. Markscheme C 62. [1 mark] Which response takes place when blood glucose levels are low? A. Glucagon is released from the of the pancreatic islets. B. Glucagon is released from the cells α β of the pancreatic islets. C. Insulin is released from the cells of the pancreatic islets. D. Insulin is α released from the cells of the pancreatic islets. β Markscheme A 63. [1 mark] During the menstrual cycle, what occurs in response to a fall in the progesterone level? A. Growth of the uterus lining B. Growth of the follicle surrounding the egg C. Ovulation D. Menstruation Markscheme D 64. [1 mark]
What is a feature of alveoli? A. They occur in all animals because they are needed for gas exchange. B. They have a higher oxygen concentration than air in the atmosphere to increase the rate of diffusion. C. They have walls that are one cell thick for faster diffusion. D. They are small so keep the gases inside them more concentrated. Markscheme C 61. [1 mark] What is a characteristic of axons in motor neurons? A. When there is a resting potential, the outside of the axon is negative relative to the inside. B. During an action potential, Na ions diffuse out of the axon. C. K ions diffusing out of the axon repolarizes it. D. Impulses in the axon travel towards the cell body. Markscheme C 62. [1 mark] Which response takes place when blood glucose levels are low? A. Glucagon is released from the α of the pancreatic islets. B. Glucagon is released from the β cells of the pancreatic islets. C. Insulin is released from the α cells of the pancreatic islets. D. Insulin is released from the β cells of the pancreatic islets. Markscheme A 63. [1 mark] During the menstrual cycle, what occurs in response to a fall in the progesterone level? A. Growth of the uterus lining B. Growth of the follicle surrounding the egg C. Ovulation D. Menstruation Markscheme D 64. [1 mark]
chapter_6multiplechoice.mark2.docx