Which of the following structures is(are) produced from the endoderm?
a) Cartilage
b) Dermis of the skin
c) Kidneys and ureters
d) Internal and external ear
e) Gametes
e
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During early embryonic development, a protein called sonic hedgehog is released from a cell and travels in a small gradient through the interstitial fluid only to nearby cells. This helps to establish the path and direction of development for the nervous system and limbs. Knowing this, sonic hedgehog must be a(n) ________ signal.
A. nervous B. endocrine C. autocrine D. paracrine
An inactivated ion channel will respond to a stronger than normal threshold stimulus.
Answer the following statement true (T) or false (F)
Which of the following has a phospholipid bilayer with proteins as its structure?
a. Ribosomes. b. Mitochondria. c. Plasma membrane. d. Lysosomes.
What is the first section of the large intestine?
A. Descending colon B. Cecum C. Ascending colon D. Rectum