Two hormones that work together to elevate calcium levels in the body are ________ and ________.
A) parathyroid hormone; calcitriol
B) vitamin A; vitamin C
C) parathyroid hormone; calcitonin
D) growth hormone; calcitonin
E) vitamin D3; growth hormone
A) parathyroid hormone; calcitriol
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Which of the following is not a feature of neurons?
A. Contractility B. Conductivity C. Secretion D. Excitability E. Chromatophilic substance
When a small, polar solute binds to a membrane protein that then changes shape and transports the solute across the membrane, the process is known as
A. simple diffusion. B. channel-mediated diffusion. C. carrier-mediated diffusion. D. endocytosis. E. active transport.
Triaxial joints of the body include ________
A) the hip and shoulder B) the knee and elbow C) the ankle and wrist D) intercarpal and intertarsal joints
During embryonic development, the following major events occur except the formation of the ________.
A. embryoblast B. placenta C. extraembryonic membranes D. germ layers