<span>The Cambrian. The Cambrian Explosion, which began roughly 545 million years ago, was a relatively rapid (~5-10 million years) diversification of multicellular life, including most of the animal phyla currently extant today. This was an evolutionary arms race of sorts, with many creatures achieving both larger size as well as symmetrical bodies and various structural supports, including skeletal systems. It was also a highly experimental times in terms of evolution, as many forms of creatures arose and went extinct in rapid succession during this period.</span>
Answer:
It speeds up the reaction rate
Explanation:
Enzymes are biological catalysts. Catalysts lower the activation energy for reactions. The lower the activation energy for a reaction, the faster the rate. Thus enzymes speed up reactions by lowering activation energy.
In cardiac muscle
a. an action potential spreads throughout the Z discs.
b. intercalated discs connect the muscle fibers together.
c. calcium enters the cell from storage chambers called intercalated discs.
d. potassium is released from the sarcoplasmic reticulum
Answer:
b. intercalated discs connect the muscle fibers together.
Explanation:
Intercalated discs are components of the muscles found in the heart(cardiac muscles).
Intercalated discs join the cardiomyoctes (muscle cells or fibers) together so that they can function as one and transmit signals amongst themselves during the contraction of the heart.
Intercalated discs are made of up desmosomes and gap junctions.
Intercalated discs are found on the lining of the sacromere and can only be seen by using a microscope to observe the longitudinal section of the heart tissue.
