Osteocytes are embedded in a dense matrix of hydroxyapatite. Which of the following describes how osteocytes receive nutrients?
A) by osmosis from neighboring osteocytes.
B) by diffusion from neighboring osteoblasts cells traveling through lamellae.
C) by diffusion from nutrients released from vessels in the central canal that travel through canaliculi.
D) by diffusion from nutrients released from vessels in the central canal that travel through perforating canals.
E) by diffusion directly from nutrients stored in the periosteum.
Answer: C
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Which of the following is true about cardiac muscle tissue?
A. Cardiac muscle is voluntary. B. Cardiac muscle lacks striations. C. Intercalated discs allow atrium or ventricles to contract simultaneously. D. Intercalated discs allow slow, accurate electrical transmission between cells.
Which of the following secretion is not produced in stomach?
a. Mucus b. Gastrin c. Pepsin d. Glucogan e. Gastric intrinsic factor
If blood carbon dioxide levels rise, the ________ sends signals to the respiratory muscles to increase the rate and depth of breathing.
A. medulla oblongata B. pons C. cerebral cortex D. cerebellum
An increase in parasympathetic activity ____________________ the atrial contractility
Fill in the blank(s) with correct word