Microscopic folds that extend from the apical surface of certain epithelia to increase the surface area for absorption and secretion are called
A. microvilli.
B. mucus.
C. flagella.
D. desmosomes.
E. cilia.
Answer: A
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Label O represents which of the following structures?
A) nephron loop
B) renal corpuscle
C) proximal convoluted tubule
D) distal convoluted tubule
E) collecting duct
The heme group from the phagocytized erythrocyte is converted into a green pigment called ________.
Fill in the blank(s) with the appropriate word(s).
The ________ divides the aorta into the thoracic aorta and the abdominal aorta
A) pericardium B) mediastinum C) diaphragm D) peritoneum E) pleura
Muscle fibers generally only have one motor end plate, but motor neurons innervate many different muscle fibers in a group. Choose the statement that correctly explains how this affects muscle contraction.
A. The force of a contraction does not at all depend on the strength of the signal sent via the motor neuron. B. While muscle fibers only have one motor end plate, they can recruit each other to contract once a fiber receives a signal. C. When a motor neuron transmits a signal, only one fiber will contract with strong force. D. A signal traveling through one motor neuron can potentially make multiple fibers in a group contract, generating more force.