The iron of the heme unit of hemoglobin is transported in the blood by the protein ________ after the aged erythrocytes are phagocytized.
Fill in the blank(s) with the appropriate word(s).
transferrin
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An inverted bell-shaped curve represents the distribution of phenotypes of a multifactorial trait in a population.
Answer the following statement true (T) or false (F)
What would be the effect on bone growth of insufficient dietary calcium?
A. There would be no effect, because the body is able to synthesize calcium. B. The matrix would be softer. C. The bone would be less flexible. D. The epiphyseal plates would ossify earlier in development. E. There would be increased formation of spongy bone.
If a muscle fiber were to suddenly and permanently stop producing ATP the fiber would no longer be able to actively transport calcium out of the cytoplasm (sarcoplasm) and the intracellular calcium concentration would rise
Which of the following would you expect to happen? A) The fiber would twitch uncontrollably due to excessive calcium bound to troponin. B) Myosin would be able to bind to the exposed binding sites on thin filaments but it would not be able to detach. C) Calcium would be transported to the sarcoplasmic reticulum therefore contractions would cease. D) No change would occur in a muscle that was relaxed to begin with.
Which of the following initiates the birth process?
A. CRH targets the fetal anterior pituitary to release ACTH. B. The hypothalamus signals the posterior pituitary to secrete oxytocin. C. Progesterone production levels decrease around six months, while estrogen levels keep increasing making the uterus more likely to contract. D. All of these happen to initiate the birth process.