Trisomy refers to
A. three layers of cells.
B. the formation of the three extra-embryonic membranes.
C. there being three copies of a given chromosome instead of two.
D. the formation of triplets.
E. the development of three primary germ layers.
Answer: C
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In the embryo, parallel ridges named digital rays are visible. Which structures will they become?
A. Fingers and toes B. Leg and forearm C. Ribs and vertebrae D. Tarsals and metatarsals E. The ulna and radius
What is the first event in muscle fiber contraction?
A. Acetylcholine is released from the end of the motor neuron. B. Acetylcholine diffuses across a gap at a neuromuscular junction. C. Calcium ions diffuse from sarcoplasmic reticulum into the sarcoplasm and bind to troponin molecules. D. The muscle fiber membrane is stimulated and a muscle impulse travels deep into the fiber through transverse tubules.
The most abundant skeletal cartilage type is ________.
A) hyaline B) elastic C) fibrocartilage D) epiphyseal
Which of the following is NOT true of hypoventilating?
A. The brain will try to increase respiration to bring back homeostasis. B. Breathing is at a lower-than-normal rate. C. Blood carbon dioxide levels decrease. D. Blood pH decreases, causing acidosis.