The knee jerk reflex (when the quadriceps muscles contract after the patellar tendon is tapped) is directed by the
A. autonomic nervous system.
B. somatic nervous system.
B
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Only substances that are filtered by the kidneys can be excreted by them.
Answer the following statement true (T) or false (F)
In IgG, the antigen binding site is formed by the
A) variable segment of the light chain. B) variable segment of the heavy chain. C) constant segment of the heavy chain. D) variable segments of both the light and heavy chains. E) ionized segment of the light chain and the isotropic segment of the heavy chain.
Describe characteristics of receptors at the synapses. Select all that apply.
a. They only open in response to voltage changes across the membrane b. All receptors are gated ion channels c. Only specific molecules are able to bind to the receptors d. They are ligand activated receptors
During the later part of fetal development, the testes descend into the scrotum through the
A. ejaculatory duct. B. epididymis. C. ureters. D. inguinal canal. E. urethra.