TEAS Science Practice Test #5 3 Flashcards
6 cards from real TEAS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 TEAS Science Practice Test #5 3 flashcards as text
Which of the following correctly describes negative feedback in the endocrine system?
Answer: The output of a system inhibits further production, maintaining balance
Negative feedback loops maintain homeostasis by having the output of a system suppress the initial stimulus. For example, rising blood glucose levels trigger insulin release, which lowers glucose levels, reducing the stimulus for further insulin secretion.
What is the structural and functional unit of skeletal muscle?
Answer: Sarcomere
The sarcomere is the basic contractile unit of skeletal muscle, bounded by Z-lines. It contains overlapping thick (myosin) and thin (actin) filaments that slide past each other during muscle contraction according to the sliding filament theory.
Which of the following statements about viruses is correct?
Answer: Viruses consist of genetic material enclosed in a protein coat and require a host cell to replicate
Viruses are acellular particles consisting of nucleic acid (DNA or RNA) enclosed in a protein coat (capsid). They are not independently alive — they must invade a host cell and hijack its cellular machinery to replicate.
Which of the following correctly describes the law of conservation of mass?
Answer: The total mass of reactants equals the total mass of products in a chemical reaction
The law of conservation of mass states that in a chemical reaction, matter is neither created nor destroyed. The total mass of all reactants equals the total mass of all products, which is why chemical equations must be balanced.
What is the function of the meninges?
Answer: To protect the brain and spinal cord with three layers of connective tissue
The meninges are three protective membranes (dura mater, arachnoid mater, and pia mater) that surround and protect the brain and spinal cord. They also help contain the cerebrospinal fluid (CSF) that cushions the central nervous system.
Which of the following correctly pairs an organ with its primary function in the endocrine system?
Answer: Pancreas — produces insulin to regulate blood glucose
The pancreas produces insulin (from beta cells) and glucagon (from alpha cells) to regulate blood glucose levels. The thyroid regulates metabolism; the adrenal glands produce stress hormones (cortisol, epinephrine); the pineal gland produces melatonin.