Which organelle controls the activities of the cell, such as protein synthesis, gene action, cell division, and metabolic rate?
A) nucleus
B) mitochondria
C) rough endoplasmic reticulum
D) lysosomes
A
Explanation:
B) The mitochondria produce energy for the cell.
C) The rough endoplasmic reticulum synthesizes proteins.
D) Lysosomes are vesicles filled with powerful enzymes to "clean" the cell.
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The principle that increasing the end-diastolic volume results in a corresponding increase in the stroke volume is known as
A) afterload. B) cardiac capacity. C) cardiac reserve. D) Frank-Starling principle. E) expandibility.
The ectoderm forms which of the following?
A) muscle B) all lymphatic structures C) the cardiovascular system D) the thymus, thyroid gland, and pancreas E) all neural tissues
Action potentials from hypothalamic neurons cause the release of this hormone
A) luteinizing hormone (LH) B) prolactin C) growth hormone (GH) D) oxytocin
You have just disembarked from an airplane following a cross-country flight. You are experiencing difficulty in hearing and notice that your ears are plugged. To relieve the pressure you try "yawning" to clear the ear canal. It worked. What muscle was involved?
A. Salpingopharyngeus B. Tensor veli palatini C. Levator veli palatini D. Middle constrictor E. Palatopharyngeus