Which of these is the main function of the blood-brain barrier?
Protects the CNS by selecting the substances that can enter the cerebrospinal fluid from the blood
Prevents any molecules from entering the cerebrospinal fluid from the blood
Coordinates the nervous and endocrine systems by influencing the pituitary gland
Filters sensory input and keeps the cerebral cortex in an alert state
Protects the CNS by selecting the substances that can enter the cerebrospinal fluid from the blood
Explanation:
The reticular activating system filters sensory input and keeps the cerebral cortex in an alert state, while the hypothalamus coordinates the nervous and endocrine systems by influencing the pituitary gland.
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The letter “C” in the above figure represents
a. sclerenchyma fibers. b. parenchyma. c. xylem. d. epidermis. e. phloem.
Which type of cell produces proteins that form the tough, water-insoluble layer in the skin?
a. melanocytes b. Granstein cells c. keratinocytes d. Langerhans cells e. pigmented cells
The deepest layer of the epidermis is the stratum corneum
____________________ Indicate whether the statement is true or false.
Which of the following would be composed of smooth muscle?
A) Ventricles of the heart B) Muscles of the uterus C) Muscles that allow you to cross your eyes D) Quadriceps (leg muscle)