In a healthy kidney, glucose and amino acids are reabsorbed into the blood at which location in the nephron?
A) Ureter
B) Proximal tubule
C) Distal tubule
D) Glomerulus
E) Nephron loop
B
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Due to its system of air sacs connected to the lungs, the respiratory system of birds is arguably the most effective respiratory system of all air-breathers. Upon inhalation, air first flows into posterior air sacs, then into the lungs, and then into anterior air sacs on the way to being exhaled. Thus, there is one-way flow of air through the lungs, along thousands of tubules called parabronchi. If the inner lining of the air sacs is neither thin nor highly vascularized, then what can be inferred about the air sacs? A) They must not belong to the respiratory system. B) They cannot be derived from endoderm. C) They are not efficient sites of gas exchange between air and blood. D) They must obtain nutrition from some source other than the bloodstream. E) They cannot effectively moisturize the air before it reaches the lungs.
Which major tissue category has cells that can contract?
a. epithelium b. connective tissue c. muscle tissue d. nervous tissue e. adipose tissue
Factors such as behavioral, temporal, or ecological isolation mechanisms that prevent two closely related sympatric populations from interbreeding can be grouped together and classified as ________
A) prezygotic isolating mechanisms B) postzygotic isolating mechanisms C) polyploidy hybrid speciation D) adaptive radiation
The male urethra is lined with ________ tissue.
a. connective b. squamous c. cuboidal simple d. columnar stratified e. muscle