Nokea
Which type of muscle tissue is found in the heart?
- A. Smooth Muscle
- B. Skeletal Muscle
- C. Cardiac Muscle
- D. Elastic Muscle
Correct Answer: C
Rationale: The correct answer is C: Cardiac Muscle. Cardiac muscle tissue is specifically found in the heart and is responsible for its involuntary contractions to pump blood throughout the body. Cardiac muscle has unique features that enable synchronized contractions, essential for maintaining the heart's function, unlike skeletal and smooth muscles.
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Which type of joint within the synovial category is the elbow classified as?
- A. Pivot
- B. Hinge
- C. Ball and socket
- D. Toddle
Correct Answer: B
Rationale: The correct answer is B: Hinge. The elbow joint is classified as a hinge joint within the synovial category. Hinge joints primarily allow for flexion and extension movements, resembling a door hinge. In the case of the elbow joint, it enables the bending and straightening actions of the arm, crucial for various activities involving the upper limb.
Which structure of the nervous system carries action potentials in the direction of a synapse?
- A. cell body
- B. axon
- C. neuron
- D. myelin
Correct Answer: B
Rationale: The correct answer is the axon. The axon is a long, slender projection of a neuron that carries nerve impulses away from the cell body towards other neurons, muscles, or glands. Action potentials travel along the axon to the axon terminals where they lead to the release of neurotransmitters at the synapse, allowing communication with other neurons or target cells. The cell body contains the nucleus and organelles of the neuron but does not transmit action potentials. Neurons are the functional unit of the nervous system composed of the cell body, dendrites, and axon. Myelin is a fatty substance that surrounds and insulates axons, helping to speed up the transmission of nerve impulses but does not carry action potentials towards the synapse.
The calcaneus is located in what part of the body?
- A. Foot.
- B. Mouth.
- C. Head
- D. Hand.
Correct Answer: A
Rationale:
To where are all the nutrients that enter the hepatic portal vein routed for decontamination?
- A. Kidney
- B. Pancreas
- C. Spleen
- D. Liver
Correct Answer: D
Rationale: When nutrients are absorbed from the digestive tract, they enter the hepatic portal vein and are transported directly to the liver. The liver acts as a filter, processing and detoxifying these nutrients before they are further distributed to the rest of the body. Therefore, the correct answer is the liver, which plays a crucial role in detoxifying substances that enter the body through the digestive system.
Which of the following are tropic hormones? (Select one that doesn't apply.)
- A. Somatotropin
- B. Follicle-stimulating hormone
- C. Antidiuretic hormone
- D. Thyroid-stimulating hormone
Correct Answer: C
Rationale: Tropic hormones are hormones that stimulate other endocrine glands to release their hormones. Antidiuretic hormone (C) is not a tropic hormone; it acts on the kidneys to regulate water balance. Somatotropin (A), follicle-stimulating hormone (B), and thyroid-stimulating hormone (D) are all tropic hormones that stimulate the release of hormones from other glands.