If you were in a bike accident that resulted in bleeding, explain why the injury must be deeper than the epidermis
What will be an ideal response?
The epidermis is the outermost layer of skin. It is composed mostly of dead epithelial cells, which do not require a blood supply. The closest blood vessels to the skin surface lie in the dermis, so the injury must have at least penetrated the second layer of the integumentary system.
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During the initiation of nitrogen-fixation nodules, how do the Rhizobium bacteria enter into the cortex of the root?
A. through the plasmadesmata of the root hairs B. via the apoplastic pathway C. using proton pumps D. through a membrane tube called an infection thread E. by repeated cell divisions
The separation of charge between the
cytoplasm of an unfired neuron and the interstitial fluid creates
a. kinetic energy. b. mechanical energy. c. potential energy. d. chemical energy. e. activation energy
The growth hormone is called
a. prolactin. b. adrenalin. c. thyroxine. d. ACTH. e. somatotropin.
What are cytokines?
A) alert hormones that trigger the body to prepare for injury by shrinking capillaries and increasing platelet production B) enzymes that promote the replication and gathering of leukocytes C) carbohydrates which reduce inflammation in the body D) signaling proteins that help cells communicate with each other, initiating and coordinating immune actions E) organic chemicals which stimulate fever via an increase in metabolism