Essential amino acids are those required by the body to build proteins, whereas nonessential amino acids are not required by the body to build proteins.
Answer the following statement true (T) or false (F)
False
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Which best describes a "myofibril"?
A. It is composed of a single type of protein and forms cross-bridges. B. It is a cylindrical cellular organelle composed of myofilaments. C. It is a single skeletal muscle cell. D. It is a fibrous junction between a muscle cell and a tendon. E. It is a hollow membranous structure that stores calcium.
Which of the following bones contains a sac that collects tears and passes them into the nasal cavity?
a) Maxilla b) Sphenoid c) Nasal d) Ethmoid e) Lacrimal
Which hormone influences the concentration of hydrogen ions in the filtrate formed by the kidneys?
A) parathyroid hormone B) atrial natriuretic peptide (ANP) C) vitamin D3 (calcitonin) D) aldosterone
The receptors that are found on all autonomic ganglionic neurons as well as at the neuromuscular synapse of the SNS are
A) muscarinic receptors. B) nicotinic receptors. C) delta receptors. D) beta receptors. E) alpha receptors.