Describe the four classes of membrane receptor molecules.
What will be an ideal response?
Ligand-gated receptors are ion channels, integrins are linked to the cytoskeleton, receptor-enzymes activate intracellular enzymes, G protein-coupled receptors involve activation of G proteins.
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The tall slender body shape that helps to dissipate heat in people native to equatorial regions is an example of
A. homeostasis. B. phase shift. C. set point resetting. D. an adaptation. E. acclimatization.
The most significant reason that the hip joint is less mobile than the shoulder joint is
A) the decrease in ligament and tendon attachments. B) the increase in bursae that limit movements. C) the weight of the lower limb. D) the almost complete bony socket enclosing the head of the femur. E) None of the answers are correct.
Which of the following hormones stimulates the synthesis of testosterone by the fetal testes?
A. human chorionic gonadotropin (hCG) B. follicle-stimulating hormone (FSH) C. gonadotropin-releasing hormone (GnRH) D. luteinizing hormone releasing hormone (LH-RH) E. estrogen
Which muscle dorsiflexes and inverts the foot?
A. Peroneus B. Gastrocnemius C. Soleus D. Tibialis anterior