The rubbery matrix of cartilage is secreted by , whereas produce the fibers and ground substance that form the matrix of fibrous connective tissue.

The correct answer is - Chondroblasts; Fibroblasts

Explanation:

Mesenchymal progenitor cells will form chondrocytes combinedly called Chondroblasts that is responsible for the secretion of the rubbery matrix of cartilage.

Fibroblast on other hand produces fibers and ground substance. These ground substances and fibers make the matrix of the fibrous connective tissue.

because of

endo:

regulates body hormones, aldosterone, vasopressin

neural:

signal, regulates body using electric signals, reflex

endo has to do with hormones; aldosterone and vasopressin are both hormones. i also had this question and got it right : d