Which type of muscle tissue causes contraction of the heart?
A. skeletal muscle
B. smooth muscle
C. cardiac muscle
C
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When table salt, sodium chloride (NaCl), is placed in water ________
A) Ionic bonds between Na+ and Cl- are broken B) Na+ and Cl- form polar covalent bonds with each other C) Na+ and Cl- become separated by their Van der Waals forces D) Na+ and Cl- form ionic bonds with each other E) Na+ and Cl- form hydrogen bonds with water
The antigen-antibody reaction is an example of the regulation function of blood.
Answer the following statement true (T) or false (F)
The yolk sac
A. gives rise to the primary germ layers. B. forms blood cells in early development. C. stores metabolic wastes until the fetus is born. D. provides nutrients to the fetus when the umbilical cord is disconnected.
The muzzle is:
A) the snout B) the projecting part of the head of animals that includes the mouth, nose, and jaws C) a restraining device that prevents an animal from biting D) B and C E) all of the above