Osteocytes have important functions in the skeleton. Bone is a dynamic tissue that is constantly being reshaped by osteoblasts, which produce and secrete matrix proteins and transport mineral into the matrix, and osteoclasts, which break down the tissue.
The delay between the atrial and ventricular contractions is caused by the atrioventricular node (AV node). The AV node is a small cluster of cells located between the atria and ventricles.
It acts as a gatekeeper, slowing down the electrical signal from the atria so that the ventricles have time to fill with blood before they contract.
There are two main reasons for the delay at the AV node:
The AV node cells have a high threshold for depolarization. This means that they need to be depolarized to a higher level than the cells in the atria before they will fire an action potential.
The AV node cells have a long refractory period. This means that they cannot be re-excited for a period of time after they have fired an action potential.
The combination of these two factors creates a delay of about 0.12 seconds between the atrial and ventricular contractions. This delay is essential for proper heart function, as it allows the ventricles to fill with blood before they contract.
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Answer:
ventricular dyssynchrony
Explanation:
(B) starch; polysaccharide
(C) starch; carbohydrate
(D) glucose; carbohydrate
(E) glucose; monosaccharide
The pair that is not the correct relationship is glucose and polysaccharide. The correct option is A.
The sugar that is included in carbohydrates is referred to as saccharide. As these sugar joined together by certain bonding they lead to the formation of a polymer chain.
This polymer chain having several sugar units is referred to as a polysaccharide.
Glucose is a monomer and is the smallest unit of polysaccharide.
Thus, the correct option is A.
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