For heart muscles to beat in a coordinated rhythm ions must move from one cell to the next through ____.
A. gap junctions
B. hemidesmosomes
C. focal adhesions
D. adherens junctions
E. desmosomes
A. gap junctions
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In order for the cell to be able to input energy into necessary endergonic reactions, energy-generating processes such as photosynthesis, fermentation, and respiration are used to produce ________.
Fill in the blank(s) with the appropriate word(s).
In the diagram, which of the following is true?
A. Both diagrams show developmental sequences occurring in the same animal.
B. Both diagrams show blastulae.
C. Diagram II shows gastrulation in a bird.
D. Diagram I shows gastrulation in a frog.
E. Diagram I shows gastrulation in a mammal and diagram II shows gastrulation in a reptile.
The outer layer of the skin is composed of protective____ epithelium
a. simple squamous b. simple cuboidal c. stratified columnar d. simple columnar e. stratified squamous
A covalent bond is formed between an anion and a cation.
Answer the following statement true (T) or false (F)