The direction of impulses through the conduction system of the heart is normally
a. AV node->SA node->bundle of His->Purkinje fibers
b. AV node->bundle of His->SA node-->Purkinje fibers
c. bundle of His->AV node->Purkinje fibers->SA node
d. SA node->AV node->bundle of His->Purkinje fibers
e. SA node->bundle of His->Purkinje fibers->AV node
D
You might also like to view...
Answer the following statement(s) true (T) or false (F)
1. Breasts are present in both males and females, whereas functional mammary glands are only present in females. 2. The skin carries out the first step in the synthesis of vitamin D. 3. Living keratinocytes exfoliate from the epidermis as tiny specks called dander. 4. The deeper of the two layers of the skin is the hypodermis.
Climbing at high altitude where oxygen levels are insufficient can lead to
A. respiratory acidosis. B. respiratory alkalosis. C. metabolic acidosis. D. metabolic alkalosis.
Aldosterone promotes water reabsorption by controlling the reabsorption of salt
Indicate whether the statement is true or false
Stratified squamous epithelium in the mucosal layer and skeletal muscle in the muscular layer are characteristic of which of the following?
A) Esophagus B) Stomach C) Small intestine D) Large intestine