Which of the following layers of skin lack blood vessels?
Papillary
Epidermis
Reticular
Hypodermis
The Correct Answer is B
The layer of skin that lacks blood vessels is the epidermis. The epidermis is the thin outer layer of the skin and does not have any blood vessels within it. It is composed of keratinized, stratified squamous epithelium and is made of four or five layers of epithelial cells, depending on its location in the body.
The other options are not correct because they do contain blood vessels. The papillary layer is part of the dermis, which contains blood vessels ¹. The reticular layer is also part of the dermis and contains blood vessels. The hypodermis is a layer below the dermis and also contains blood vessels.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Most of the carbon dioxide from the blood moves into the alveoli by diffusion down a concentration gradient ¹. Carbon dioxide is always carried in the blood and is released into alveolar air during expiration ¹. Respiratory gases move from higher concentration to lower concentration ¹. In alveolar air, when carbon dioxide is less than in blood, carbon dioxide is released ¹.
The other options are not correct because they do not accurately describe the process by which most of the carbon dioxide from the blood moves into the alveoli. Passive transport using carrier proteins, active transport using energy, and conversion to carbon monoxide are not the processes responsible for moving most of the carbon dioxide from the blood into the alveoli.
Correct Answer is C
Explanation
. Atoms, cells, tissues, organs. This is the correct order of structures from simple to complex. Atoms are the smallest and simplest units of matter. Cells are made up of atoms and are the basic units of life.
Tissues are groups of similar cells that work together to perform a specific function. Organs are made up of different types of tissues and perform more complex functions.
A. Cells, tissues, atoms, and organs is not in the correct order from simple to complex.
B. Atoms, organs, tissues, cells is not the correct order from simple to complex.
d. Organs, tissues, cells, atoms is not the correct order from simple to complex.
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